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, meaning In Contact) is a Russian-based online social media and social networking service.
It is available in several languages but it is especially popular among Russian-speaking users.
In December 2008 VK overtook rival Odnoklassniki as Russia's most popular social networking service.
VK allows users to message each other publicly or privately, to create groups, public pages and events, share and tag images, audio and video, and to play browser-based games.
VKontakte was incorporated on 19 January 2007 as a Russian limited liability company.
User registration was initially limited to within university circles exclusively by invitation, but the site still grew quickly.
In February 2007 the site reached a user base of over 100,000 and was recognized as the second largest player in Russia's nascent social network market.
In 2010, this dispute was settled by the Russian Supreme Arbitration Court in favour of the social network.
The court ruled that VK is not responsible for its users’ copyright violations, taking into account that both parties agreed with the technical possibility to identify the user who posted illegal content and who, consequently, must incur the liability.
VK performed DDOS attacks on certain sites, making users' browsers send multiple requests to the target site without their consent.
The targets were the Runet Prize voting page in 2008 It was done by inserting an iframe and a piece of Java Script code which periodically reloaded the iframe.
In April 2014, Durov stated he had sold his stake in the company after "coming under increasing pressure" from federal law enforcement to hand over personal details of users who were members of a VK group dedicated to the Euromaidan protest movement.