Odnoklassniki - Russia

Rather popular in Russia, Kyrgyzstan and Armenia, Odnoklassniki is a social networking service for classmates and friends. Launched in 2006, the site claims more than 45 million registered users, to be mostly highly educated men under the age of 35. Communication languages are Russian and Ukrainian. With a sizable amount of revenues and a few awards, Odnoklassniki currently boasts 69th at the Alexa internet traffic ranking service.

Social networks comprehensive list (work in progress).