1-1 private messages (with end-to-end encryption) seems like it would be good for folks expecting a Twitter experience
I can see this being a valuable feature in a social media app, but I'm a little ambivalent about 1-1 features fitting/belonging in the Activity Pub specification
Could social media apps not cohesively implement both Activity Pub for the 1:n features and some other protocol (Signal, Whisper, etc) for the 1:1 features?