Thanks for your input. I've never been really satisfied with the level of interaction of messengers. They usually end up as a firehose of short messages, where everything meaningful and important is lost in the noise. It's good for quick notifications, for sure.

What I'm imagining, for the types of things that I like to do with friends and family, is more oriented around long term social interactions. This means being able to plan and view events, view and split payments, and build a persistent group album -- to start. When I'm sharing videos, music, or recommendations, I don't want it to get lost as soon as it reaches the top of the screen.

This is where messaging falls short and I believe it can be supplemented by a lot of the features of traditional social networks.