The Telegram app closed a channel run by Roohallah Zam after Iranian authorities complained that it was inciting violence, just hours before the government shut down the app entirely on Sunday. Zam, who denies the allegations, meanwhile launched new channels to spread messages about upcoming protests and share videos from demonstrations.
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It's hard to overstate the power of Telegram in Iran. Of its 80 million people, an estimated 40 million use the free app created by Russian national Pavel Durov. Its clients share videos and photos, subscribing to groups where everyone from politicians to poets broadcast to fellow users.

While authorities ban social media websites like Facebook and Twitter and censor others, Telegram users can say nearly anything. In the last presidential election, the app played a big role in motivating turnout and spreading political screeds.

Telegram touts itself as being highly encrypted and allows users to set their messages to "self-destruct" after a certain period, making it a favourite among activists and others concerned about their privacy. That too has made it a worry of Iranian authorities.