In 2018, Russia banned Telegram although it reversed the prohibition two years later. For example, WhatsApp restricted the number of times a user could forward something, and developed automated systems that detect and flag objectionable content. What distinguishes the app from competitors is its use of what's known as channels: Public or private feeds of photos and videos that can be set up by one person or an organization. The channels have become popular with on-the-ground journalists, aid workers and Ukrainian President Volodymyr Zelenskyy, who broadcasts on a Telegram channel. The channels can be followed by an unlimited number of people. Unlike Facebook, Twitter and other popular social networks, there is no advertising on Telegram and the flow of information is not driven by an algorithm. Russian President Vladimir Putin launched Russia's invasion of Ukraine in the early-morning hours of February 24, targeting several key cities with military strikes. Despite Telegram's origins, its approach to users' security has privacy advocates worried.
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