Scuttlebutt is a social network platform where each uxer has a personal diary where each page is a signed message that links to the previous page. to receive updates on someone's diary, you follow the person. on each page, content is free-form. the most common message type is 'post', but there's a chat app (similar to Cabal) that uses message type 'scat_message': https://www.scuttlebutt.nz/applications#scat.

Cabal is a chat app, built using the Dat protocol (https://datproject.org/). Dat has a similar architecture, except the diaries (sigchains) are centered on content rather than people. so to receive updates on a diary, you follow the _content_, which in Cabal is a chat group similar to a Slack group.