Одноклассники ok ru Russian: Однокла́ссники

History: Following tests of a new instant messaging platform on Facebook in March 2008, the feature, then-titled "Facebook Chat", was gradually released to users in April 2008. Facebook revamped its messaging platform in November 2010, and subsequently acquired group messaging service Beluga in March 2011, which the company used to launch its standalone iOS and Android mobile apps on August 9, 2011. Facebook later launched a BlackBerry version in October 2011. An app for Windows Phone, though lacking features including voice messaging and chat heads, was released in March 2014. An iPad-optimized version of the iOS app was released in July 2014. In April 2015, Facebook launched a website interface for Messenger. A Tizen app was released on July 13, 2015. Facebook launched Messenger for Windows 10 in April 2016. In October 2016, Facebook released Facebook Messenger Lite, a stripped-down version of Messenger with a reduced feature set. The app is aimed primarily at old Android phones and regions where high-speed Internet is not widely available.

In December 2017, Facebook announced Messenger Kids, a new app aimed for persons under 13 years of age. The app comes with some differences compared to the standard version. In 2019, Facebook Messenger announced to be the 2nd most downloaded mobile app of the decade, from 2011 to 2019. In December 2019, Facebook Messenger dropped support for users to sign in using only a mobile number, meaning that users must sign in to a Facebook account in order to use the service.

• 
  VKontakte