[will_hughes]

Do they? Do you have evidence to back that up?

The bits I've read suggest that they don't - or at least not widely.

Eg: https://www.schneier.com/blog/archives/2015/11/paris_terrori...

[stoshe]

http://www.businessinsider.com/telegram-isis-app-encrypted-p...

[will_hughes]

There's only one mention of ISIS affiliated chat channels on Telegram, not that it's actually been used by actual terrorists.

The rest of the speculation in that article was called out and refuted by the link I supplied.