Type of site
|Created by||Albert Popkov (founder and head)|
|Alexa rank||56 (January 2016)|
|Registration||Required; no payment needed since August 31, 2010|
|Launched||March 4, 2006|
Odnoklassniki, OK.ru (Russian: ?; English: Classmates) is a social network service for classmates and old friends. It is popular in the Russian Federation and former Soviet Republics. The site was developed by Albert Popkov on March 4, 2006.
The website currently has more than 200 million registered users and 45 million daily unique visitors. Users have to be at least seven years old to make an account. Odnoklassniki also currently has an Alexa Internet traffic ranking of 56 worldwide and 7 for Russia. Revenues in the first quarter of 2008 for Odnoklassniki amounted to $3.3 million.
The site has been online for at least eight years. Compared with internet averages, Odnoklassniki.ru's users tend to be under the age of 35, and they tend to be men earning less than $30,000 who have postgraduate educations and browse from home. The site is particularly popular among users in Uzbekistan (where it is ranked #2), Kyrgyzstan (#4) and Georgia (#4).
The server that hosts odnoklassniki.ru is located in Moscow, Russian Federation. The server is located on the Golden Telecom network (Moscow, Russia). The programming language used on the site is Java and the main language used for the site's textual content is Russian. The site is using the Apache Tomcat web server. 
In February 2008, British company I-CD accused Albert Popkov of violating their copyright. According to I-CD, Albert Popkov as an employee of I-CD worked on their projects 192.com and Passado until his resignation in November 2005. In December 2006 the company raised 10 million Euro to expand Passado in Russia. Albert Popkov allegedly used the proprietary information to create his own site very similar to Passado. He denied those allegations but was later dismissed as Managing Director by Odnoklassniki and in November 2009 after the first day of trial in the Royal Court of Justice in London I-CD completely dropped all charges against Albert Popkov and Odnoklassniki after Albert Popkov and Odnoklassniki agreed to pay i-CD an undisclosed amount of cash in settlement of the case against them.
On September 15, 2008, Vedomosti announced that Albert Popkov, founder and key shareholder in Odnoklassniki had sold controlling interest in the network to Digital Sky Technologies (DST), the owner of Mail.ru. DST and its subsidiary Forticom together control 58% of the network. On the previous day it was announced during a news conference that the network's interface would be translated into Azerbaijani.
In 2012, Venture Village named the site as among 'The Top 10 Russian Internet Brands Out to Conquer the World' 
In May 2017, Ukrainian President Petro Poroshenko signed a decree to impose a ban on Mail.ru and its widely-used social networks including VKontakte and Odnoklassniki as part of its continued sanctions on Russia for its annexation of Crimea and involvement in the War in Donbass. The move was widely criticised as censorship, and Reporters Without Borders condemned the ban, calling it a "disproportionate measure that seriously undermines the Ukrainian people's right to information and freedom of expression." Respondents in an online poll on the UNIAN site declared that 66% were "categorically against" the ban of Russian sites and another 11% said it would be easier to "ban the whole internet, like in North Korea".
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