My anecdote - out of, say, 50 people I know, two have Telegram. The rest use a combination of iMessage, Facebook messenger, and WhatsApp.
22yo male.
(So: like what the internet used to be like in olden times. But still.)
I think it’s the first one to give the ability to edit messages after you sent them.
(So: like what the internet used to be like in olden times. But still.)