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After becoming the most downloaded non-gaming app earlier this year, Telegram messaging app has amassed half a billion users – a quarter of WhatsApp’s and rising. Owned by the elusive Russian exile Pavel Durov, Telegram has been used to coordinate global protest movements - from Belarus to Iran and Hong Kong. It’s also been accused of tolerating the extremist channels behind ISIS and the Capitol Hill riots.

But in its home country, Russia, misogyny appears to be permitted on the platform. Ivana Davidovic hears from women who worried for their safety when their personal information, including addresses and workplace details, were posted on Telegram channels, subjecting them to threats.

Professor Megan Squire from Elon University in the US tells how she also received threats following her research into far-right groups on the platform, and about her fears that those groups might only get bigger if Telegram proceeds with plans to pay content creators.

Digital security expert Raphael Mimoun looks under the app’s bonnet, explaining whether its privacy promises to users are up to scratch. And journalist Max Seddon profiles the founder and CEO Pavel Durov.