Fritter
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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 Vancilβ. 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.