I don't really like Signal. I don't like Telegram either. Wire is acceptable, but also clunky. It kinda sucks that people have to basically choose and commit to one app with all of their contacts now, if IM apps were federated like e-mail and Mastodon you could just keep talking to your friends from wherever.
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@Gargron Others have already mentioned #XMPP. And @mike has put up https://git.chinwag.org/chinwag/ejabberd-auth-mastodon as auth script for authentication of ejabberd using Mastodon as a user backend.
@lars XMPP is federated.
And ejabberd is quite easy to setup, so maybe you just want to try it out on your server? 🙂
Sure if no one using it from my family and other friends i have no reasons to set it up. ;)
@0 no, What?? 
@ij
Federated would be really nice.
@Gargron @mike