From IndieWeb

Fritter is a P2P Twitter-like app accessible over Dat. Currently easiest to use with Beaker.

Some users can be found in a Twitter thread by Tara Vancilโ€. IndieWeb users include Kevin Marks, who has a rel-me link from his website to his Fritter (Dat-protocol).

Kevin Marks provides a quick overview of Fritter and Dat on This Week in Google Episode #444: The Fritter Critter at approximately 1h 35m 40s.