I have to confes that I am lost between #activitypub, #matrix, #xmpp etc, not to mention irc and all the proprietary platforms, before we dig into the specializations (text, video, audio etc) or the deeper #decentralization stuff like #dat and #ipfs
I think I could use an updated "internet for dummies" kind of review
https://www.privacytools.io/ might be considered to be simple privavacy guide.
Unfortunetally, I'm not aware of any really comprinhensive text right now. Even EFF thinks that situation is a mess and they were speaking just about the more "mainstream" messaging apps. https://www.eff.org/deeplinks/2018/03/secure-messaging-more-secure-mess
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