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          <div id="mw-content-text" style="direction: ltr;"><h1 class="section-heading" tabindex="0" aria-haspopup="true" data-section-id="0">
  <span class="mw-headline" id="title_0">NK.pl</span>
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  <p><b>NK.pl</b>, formerly <b>Nasza-klasa.pl</b> (<i>nasza klasa</i> is <a href="Polish_language" title="Polish language">Polish</a> for "our class"), is a <a href="Poland" title="Poland">Polish</a> school-based <a href="Social_networking_service" title="Social networking service">social networking service</a> used by alumni and students.<span class="mw-ref reference" id="cite_ref-1"><a href="#cite_note-1" style="counter-reset: mw-Ref 1;"><span class="mw-reflink-text">[1]</span></a></span> NK.pl is owned 70% by <a href="Forticom" title="Forticom">Forticom</a>, an IT company based in Latvia, and the rest is owned by the Polish Nasza-Klasa <a href="Limited_liability_company_(Poland)" title="Limited liability company (Poland)" class="mw-redirect">Sp.z.o.o.</a>, Nasza-Klasa's founding company.<span class="mw-ref reference" id="cite_ref-nasza-klasa_2-0"><a href="#cite_note-nasza-klasa-2" style="counter-reset: mw-Ref 2;"><span class="mw-reflink-text">[2]</span></a></span>
Founded in 2006</p>


<table class="infobox vcard" style="width:22em"><caption class="fn org">NK.pl</caption><tbody><tr><td colspan="2" style="text-align:center"><span class="mw-default-size"><img src="../I/Logo_NK.svg.png.webp" data-file-width="567" data-file-height="567" data-file-type="drawing" height="220" width="220" loading="lazy"></span></td></tr><tr><th scope="row">Type of business</th><td class="category"><a href="Privately_held_company" title="Privately held company">Privately held company</a></td></tr><tr><th scope="row"><div style="display:inline-block; padding:0.1em 0;line-height:1.2em;">Type of site</div></th><td><a href="Social_network" title="Social network">Social network</a></td></tr><tr><th scope="row">Owner</th><td><a href="Forticom" title="Forticom">Forticom</a> (~70%)<br>Nasza Klasa Sp. z o.o. (~30%)</td></tr><tr><th scope="row">URL</th><td class="url"><span class="url"><a href="http://www.nk.pl/" class="external text external">www<wbr>.nk<wbr>.pl</a></span></td></tr><tr><th scope="row">Registration</th><td>required</td></tr></tbody></table>


</div><details data-level="2" open="">
    <summary class="section-heading"><h2 id="History">History</h2></summary>
    
<p>NK.pl was launched on 11 November 2006 by <a href="Maciej_Popowicz" title="Maciej Popowicz">Maciej Popowicz</a>, Paweł Olchawa, Michał Bartoszkiewicz, and Łukasz Adziński, four college students studying computer science at the <a href="University_of_Wroc%C5%82aw" title="University of Wrocław">University of Wrocław</a>.<span class="mw-ref reference" id="cite_ref-3"><a href="#cite_note-3" style="counter-reset: mw-Ref 3;"><span class="mw-reflink-text">[3]</span></a></span> The company is headquartered in <a href="Wroc%C5%82aw" title="Wrocław">Wrocław</a>, <a href="Poland" title="Poland">Poland</a>, and its name comes from the song "<i>Nasza Klasa</i>" by <a href="Jacek_Kaczmarski" title="Jacek Kaczmarski">Jacek Kaczmarski</a>.</p>

<p>The website enjoyed spectacular growth and success, and one 2009 study called it a "model example of the ‘<a href="Rags_to_riches" title="Rags to riches">rags to riches</a>’ ideal of an enterprise construed with no financial funding and no institutional support (neither from ASP/<a href="Internet_service_provider" title="Internet service provider">ISP corporations</a> nor from central/local administration)".<span class="mw-ref reference" id="cite_ref-iisit_4-0"><a href="#cite_note-iisit-4" style="counter-reset: mw-Ref 4;"><span class="mw-reflink-text">[4]</span></a></span>  Specifically, as of 2009 the service had 13.5 million active users.<span class="mw-ref reference" id="cite_ref-portal_5-0"><a href="#cite_note-portal-5" style="counter-reset: mw-Ref 5;"><span class="mw-reflink-text">[5]</span></a></span> NK.pl ranks among the top five Polish social networking portals, behind Google.pl, <a href="Onet.pl" title="Onet.pl">Onet.pl</a>, and Wirtualna Polska, and it attracts more than 50% of Polish Internet users (10% of the traffic comes from abroad).<span class="mw-ref reference" id="cite_ref-iisit_4-1"><a href="#cite_note-iisit-4" style="counter-reset: mw-Ref 4;"><span class="mw-reflink-text">[4]</span></a></span></p>

<p>As of July 2009 86% of its users lived in Poland, according to <a href="Alexa_Internet" title="Alexa Internet">Alexa</a>, but, surprisingly, it was also popular in <a href="Norway" title="Norway">Norway</a>, where it was the fifth most popular social networking website in 2009.<span class="mw-ref reference" id="cite_ref-bb_6-0"><a href="#cite_note-bb-6" style="counter-reset: mw-Ref 6;"><span class="mw-reflink-text">[6]</span></a></span> June 2010 rebranding and changes in terms of use, demanding that users allow the portal to use their main photo commercially together with selected private information, triggered mass exodus. As of August 2014 the number of registered users had plummeted to less than 7 million, with many former users having switched to <a href="Facebook" title="Facebook">Facebook</a>, the world's largest social network.<span class="mw-ref reference" id="cite_ref-7"><a href="#cite_note-7" style="counter-reset: mw-Ref 7;"><span class="mw-reflink-text">[7]</span></a></span></p>


    
</details><details data-level="2" open="">
    <summary class="section-heading"><h2 id="Services">Services</h2></summary>
    
<p>It allows users to register with particular schools and graduation years and users are able to keep and maintain personal pages with details about their personal life and past education. NK.pl does not require an invitation to join but registration is required to browse the service.</p>

<p>NK.pl offers a wide variety of <a href="Internet_privacy" title="Internet privacy">privacy</a> settings which try to make the user feel protected by offering updated advice and instructions about how to safeguard their privacy on NK.pl as well as the portal.<span class="mw-ref reference" id="cite_ref-Klasa_8-0"><a href="#cite_note-Klasa-8" style="counter-reset: mw-Ref 8;"><span class="mw-reflink-text">[8]</span></a></span> It has a privacy team that works with law enforcement to resolve matters related to threatening and dangerous posts and other illegal activity.</p>

<p>NK.pl also works with childcare services such as the Nobody's Children Foundation, which takes care of the healthy psychological and mental development of children.<span class="mw-ref reference" id="cite_ref-Klasa_8-1"><a href="#cite_note-Klasa-8" style="counter-reset: mw-Ref 8;"><span class="mw-reflink-text">[8]</span></a></span></p>


    
</details><details data-level="2" open="">
    <summary class="section-heading"><h2 id="See_also">See also</h2></summary>
    
<style data-mw-deduplicate="TemplateStyles:r936637989">.mw-parser-output .portal{border:solid #aaa 1px;padding:0}.mw-parser-output .portal.tleft{margin:0.5em 1em 0.5em 0}.mw-parser-output .portal.tright{margin:0.5em 0 0.5em 1em}.mw-parser-output .portal>ul{display:table;box-sizing:border-box;padding:0.1em;max-width:175px;background:#f9f9f9;font-size:85%;line-height:110%;font-style:italic;font-weight:bold}.mw-parser-output .portal>ul>li{display:table-row}.mw-parser-output .portal>ul>li>span:first-child{display:table-cell;padding:0.2em;vertical-align:middle;text-align:center}.mw-parser-output .portal>ul>li>span:last-child{display:table-cell;padding:0.2em 0.2em 0.2em 0.3em;vertical-align:middle}</style>
<ul><li><a href="Grono.net" title="Grono.net">Grono.net</a></li>
<li><a href="Odnoklassniki" title="Odnoklassniki">Odnoklassniki</a></li>
<li><a href="Facebook" title="Facebook">Facebook</a></li></ul>


    
</details><details data-level="2" open="">
    <summary class="section-heading"><h2 id="References">References</h2></summary>
    
<div class="reflist " style=" list-style-type: decimal;">
<div class="mw-references-wrap"><ol class="mw-references references"><li id="cite_note-1"> <span id="mw-reference-text-cite_note-1" class="mw-reference-text"><cite id="CITEREFUrszula" class="citation web cs1">Urszula, Jurgiel. <a href="http://mastersofmedia.hum.uva.nl/2011/10/02/social-death-of-social-networks/" class="external text external">"Social death of social networks"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">4 April</span> 2013</span>.</cite></span></li><li id="cite_note-nasza-klasa-2"> <span id="mw-reference-text-cite_note-nasza-klasa-2" class="mw-reference-text"><cite class="citation web cs1"><a href="https://archive.is/20120712043634/http://media.nk.pl/press/o-nas" class="external text external">"Serwis społecznościowy nk.pl<span>&nbsp;</span>— platforma komunikacji dla wszystkich internautów<span>&nbsp;</span>— nk.pl"</a>. <i>nk.pl</i>. Archived from <a href="http://media.nk.pl/press/o-nas" class="external text external">the original</a> on 2012-07-12.</cite></span></li><li id="cite_note-3"> <span id="mw-reference-text-cite_note-3" class="mw-reference-text"><a href="http://wroclaw.wyborcza.pl/wroclaw/1,35769,4526522.html" class="external free external">http://wroclaw.wyborcza.pl/wroclaw/1,35769,4526522.html</a></span></li><li id="cite_note-iisit-4"> <span id="mw-reference-text-cite_note-iisit-4" class="mw-reference-text"><cite id="CITEREFMalachowski2009" class="citation journal cs1">Malachowski, Andrzej (2009). <a href="http://iisit.org/Vol6/IISITv6p365-372Malachowski614.pdf" class="external text external">"Phenomenon of Nasza klasa (Our Class) Polish social network site"</a> <span class="cs1-format">(PDF)</span>. <i>Issues in Informing Science &amp; Information Technology</i>. <b>6</b>: 366.</cite></span></li><li id="cite_note-portal-5"> <span id="mw-reference-text-cite_note-portal-5" class="mw-reference-text"><cite id="CITEREFJan_Samołyk" class="citation web cs1">Jan Samołyk. <a href="http://nk.pl/blog/portal/wpis/165" class="external text external">"NK gra z WOŚP!"</a>. NK.pl<span class="reference-accessdate">. Retrieved <span class="nowrap">2011-10-24</span></span>.</cite></span></li><li id="cite_note-bb-6"> <span id="mw-reference-text-cite_note-bb-6" class="mw-reference-text"><cite class="citation web cs1"><a href="https://www.bloomberg.com/ss/09/07/0715_social_networking_sites/17.htm" class="external text external">"World's Top Social Networking Sites"</a>. <i>Bloomberg Business</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2 February</span> 2015</span>.</cite></span></li><li id="cite_note-7"> <span id="mw-reference-text-cite_note-7" class="mw-reference-text"><cite class="citation web cs1"><a href="http://www.se.pl/technologie/internet/nasza-klasa-jak-radzi-sobie-nk-w-erze-facebooka_416019.html" class="external text external">"Nasza Klasa. Jak radzi sobie NK w erze Facebooka?"</a>. <i>se.pl</i>. 6 August 2014.</cite></span></li><li id="cite_note-Klasa-8"> <span id="mw-reference-text-cite_note-Klasa-8" class="mw-reference-text"><cite id="CITEREFKlasa" class="citation web cs1">Klasa, Nasza. <a href="http://nk.pl/nk_policy" class="external text external">"Polityka Prywatności<span>&nbsp;</span>– Ogólne Standardy Ochrony"</a>. Nasza Klasa<span class="reference-accessdate">. Retrieved <span class="nowrap">4 April</span> 2013</span>.</cite></span></li></ol></div></div>


    
</details><details data-level="2" open="">
    <summary class="section-heading"><h2 id="External_links">External links</h2></summary>
    
<ul><li><a href="http://nk.pl/" class="external text external">The official site of nk.pl</a></li>
<li><a href="http://developers.nk.pl/wiki/Main_Page" class="external text external">Site for NK Developers</a></li></ul>

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<li><a href="Heello" title="Heello">Heello</a></li>
<li><a href="Highlight_(application)" title="Highlight (application)">Highlight</a></li>
<li><a href="Hyves" title="Hyves">Hyves</a></li>
<li><a href="IdeaPlane" title="IdeaPlane">IdeaPlane</a></li>
<li><a href="ITunes_Ping" title="ITunes Ping">iTunes Ping</a></li>
<li><a href="IWiW" title="IWiW">iWiW</a></li>
<li><a href="Jaiku" title="Jaiku">Jaiku</a></li>
<li><a href="Lifeknot" title="Lifeknot">Lifeknot</a></li>
<li><a href="LunarStorm" title="LunarStorm">LunarStorm</a></li>
<li><a href="Me2day" title="Me2day">Me2day</a></li>
<li><a href="Meerkat_(app)" title="Meerkat (app)">Meerkat</a></li>
<li><a href="MixBit" title="MixBit">MixBit</a></li>
<li><a href="Mobli" title="Mobli">Mobli</a></li>
<li><a href="Mugshot_(website)" title="Mugshot (website)">Mugshot</a></li>
<li><a href="Multiply_(website)" title="Multiply (website)">Multiply</a></li>
<li><a href="Musical.ly" title="Musical.ly">Musical.ly</a></li>
<li><a href="Natter_Social_Network" title="Natter Social Network">Natter Social Network</a></li>
<li><a href="Netlog" title="Netlog">Netlog</a></li>
<li><a href="Orkut" title="Orkut">Orkut</a></li>
<li><a href="Path_(social_network)" title="Path (social network)">Path</a></li>
<li><a href="Periscope_(app)" title="Periscope (app)">Periscope</a></li>
<li><a href="Pheed" title="Pheed">Pheed</a></li>
<li><a href="Piczo" title="Piczo">Piczo</a></li>
<li><a href="PlanetAll" title="PlanetAll">PlanetAll</a></li>
<li><a href="Posterous" title="Posterous">Posterous</a></li>
<li><a href="Pownce" title="Pownce">Pownce</a></li>
<li><a href="Qaiku" title="Qaiku">Qaiku</a></li>
<li><a href="SixDegrees.com" title="SixDegrees.com">SixDegrees.com</a></li>
<li><a href="So.cl" title="So.cl">So.cl</a></li>
<li><a href="Spring.me" title="Spring.me">Spring.me</a></li>
<li><a href="Streetlife_(website)" title="Streetlife (website)">Streetlife</a></li>
<li><a href="Surfbook" title="Surfbook">Surfbook</a></li>
<li><a href="Tbh_(app)" title="Tbh (app)">tbh</a></li>
<li><a href="Tea_Party_Community" title="Tea Party Community">Tea Party Community</a></li>
<li><a href="Third_Voice" title="Third Voice">Third Voice</a></li>
<li><a href="Tribe.net" title="Tribe.net">Tribe.net</a></li>
<li><a href="Tout_(company)" title="Tout (company)">Tout</a></li>
<li><a href="Ts%C5%AB_(social_network)" title="Tsū (social network)">Tsū</a></li>
<li><a href="Tvtag" title="Tvtag">tvtag</a></li>
<li><a href="Vine_(service)" title="Vine (service)">Vine</a></li>
<li><a href="Windows_Live_Spaces" title="Windows Live Spaces">Windows Live Spaces</a></li>
<li><a href="Wretch_(website)" title="Wretch (website)">Wretch</a></li>
<li><a href="Xanga" title="Xanga">Xanga</a></li>
<li><a href="Yahoo!_360%C2%B0" title="Yahoo! 360°">Yahoo! 360°</a></li>
<li><a href="Yahoo!_Kickstart" title="Yahoo! Kickstart">Yahoo! Kickstart</a></li>
<li><a href="Yahoo!_Mash" title="Yahoo! Mash">Yahoo! Mash</a></li>
<li><a href="Yahoo!_Meme" title="Yahoo! Meme">Yahoo! Meme</a></li>
<li><a href="Yik_Yak" title="Yik Yak">Yik Yak</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Services</th><td class="navbox-list navbox-even hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em">
<ul><li><a href="Comparison_of_social_networking_software" title="Comparison of social networking software">Software comparison</a></li>
<li><a href="White-label_product" title="White-label product">White-label</a>
<ul><li><a href="Ning_(website)" title="Ning (website)">Ning</a></li>
<li><a href="Wall.fm" title="Wall.fm">Wall.fm</a></li></ul></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Tools</th><td class="navbox-list navbox-odd hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em">
<ul><li><a href="Social_network_analysis_software" title="Social network analysis software">Social network analysis software</a></li>
<li><a href="Diaspora_(software)" title="Diaspora (software)" class="mw-redirect">Diaspora (software)</a></li>
<li><a href="Web_2.0_Suicide_Machine" title="Web 2.0 Suicide Machine">Web 2.0 Suicide Machine</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Concepts</th><td class="navbox-list navbox-even hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em">
<ul><li><a href="Online_identity" title="Online identity">Online identity</a></li>
<li><a href="User_profile" title="User profile">User profile</a></li>
<li><a href="Virtual_community" title="Virtual community">Virtual community</a></li>
<li><a href="List_of_virtual_communities_with_more_than_1_million_users" title="List of virtual communities with more than 1 million users">1+ million users</a></li>
<li><a href="Small-world_experiment" title="Small-world experiment">Small-world experiment</a></li>
<li><a href="Small-world_network" title="Small-world network">Small-world network</a></li>
<li><a href="Social_network" title="Social network">Social network</a></li>
<li><a href="Cybersectarianism" title="Cybersectarianism">Cybersectarianism</a></li>
<li><a href="Fediverse" title="Fediverse">Fediverse</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Applications</th><td class="navbox-list navbox-odd hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em">
<ul><li><a href="Social_network_advertising" title="Social network advertising">Social network advertising</a></li>
<li><a href="Social_network_hosting_service" title="Social network hosting service">Social network hosting service</a></li>
<li><a href="Online_dating_service" title="Online dating service">Online dating service</a> (<a href="Comparison_of_online_dating_websites" title="Comparison of online dating websites" class="mw-redirect">comparison</a>)</li>
<li><a href="Mobile_social_network" title="Mobile social network">Mobile</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="User_interface" title="User interface">User interface</a></th><td class="navbox-list navbox-even hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em">
<ul><li><a href="Activity_stream" title="Activity stream">Activity stream</a></li>
<li><a href="Brand_page" title="Brand page">Brand page</a></li>
<li><a href="Like_button" title="Like button">Like button</a></li>
<li><a href="Hashtag" title="Hashtag">Hashtag</a></li>
<li><a href="Group_(online_social_networking)" title="Group (online social networking)">Groups</a></li>
<li><a href="Reblogging" title="Reblogging">Reblogging</a></li>
<li><a href="Open_access_poll" title="Open access poll" class="mw-redirect">Polling</a></li>
<li><a href="Online_petition" title="Online petition">Online petitions</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Implications</th><td class="navbox-list navbox-odd hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em">
<ul><li><a href="Issues_relating_to_social_networking_services" title="Issues relating to social networking services">Issues relating to social networking services</a></li>
<li><a href="Privacy_issues_of_social_networking_sites" title="Privacy issues of social networking sites" class="mw-redirect">Privacy issues</a></li>
<li><a href="Gender_differences_in_social_network_service_use" title="Gender differences in social network service use">User gender difference</a></li>
<li><a href="Use_of_social_network_websites_in_investigations" title="Use of social network websites in investigations">Use in investigations</a></li></ul>
</div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Protocols</th><td class="navbox-list navbox-even hlist" style="text-align:left;border-left-width:2px;border-left-style:solid;width:100%;padding:0px"><div style="padding:0em 0.25em">
<ul><li><a href="ActivityPub" title="ActivityPub">ActivityPub</a></li>
<li><a href="Distributed_Social_Networking_Protocol" title="Distributed Social Networking Protocol">Distributed Social Networking Protocol</a> (defunct)</li>
<li><a href="Micropub_(protocol)" title="Micropub (protocol)">Micropub</a></li>
<li><a href="OpenSocial" title="OpenSocial">OpenSocial</a> (defunct)</li>
<li><a href="OStatus" title="OStatus">OStatus</a></li>
<li><a href="Pump.io" title="Pump.io">Pump.io</a></li>
<li><a href="XMPP" title="XMPP">XMPP</a></li></ul>
</div></td></tr></tbody></table></div>



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