Even before IS launched its latest propaganda channel via Telegram, there had been evidence that the group and its members were using the app.
Earlier in September, IS had advertised an Iraqi mobile phone number, which people could use to get in touch with the group via the Telegram app in order to pay a ransom for two hostages being held by the group.
And jihadists inspired by IS, including a British teenager convicted recently, have used the app's secure encrypted messaging to conduct attack planning.
Jihadists have been drawn by Telegram's boast to provide a "secret chat" facility, which heavily encrypts messages user-to-user with a unique key to avoid interception by hackers or government agencies.
Telegram is so confident of its security that it twice offered a $300,000 reward to the first person who could crack its encryption.
But it is the app's new public broadcast function that jihadists have been quick to latch on to and it is not just IS that has started exploiting it.
Al-Qaeda's Yemen branch (AQAP) launched its own Telegram "channel" on 25 September, although its material is still coming out first via Twitter, where the group has its own official accounts. And the Libyan Ansar al-Shari'ah group created its channel the following day.
A raft of other pro-IS and pro-al-Qaeda media groups have also set up shop there.
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