I use Keet a lot lately.
This might sound like an ad, but it’s not. Just sharing something I actually use.
No servers. No data harvesting. Messages go directly between people. 
I know most won’t bother trying it. That’s fine.
If you’re curious, watch this:
chris@mastodon.cosmicnation.co
@chris@mastodon.cosmicnation.co
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I use Keet a lot lately