OTOH that is exactly what Facebook does with groups and contacts and one of the reasons it’s so sticky over there. Because you’re going to connect with your contacts anyway, and this « brings » group/community post into that space.
I could very well imagine something like that being super precious for my community. Communities bring people together and they will want to keep that connection « outside » of the community. If the community tool allows them to bring this additional connection into the same space/app, this avoids an exodus to other social spaces of people who have built strong relationships inside the community.
I know we’re not trying to « replicate Facebook » here but it is worth pondering on why it works so well for certain things.
I’d love to be able to tell my members emigrating from Facebook « see, you can create a fediverse account and connect to people you like off topic ».
Maybe it should be thought of as a way to provide community members with an off topic space which is more « open ».
From my point of view it would make complete sense. The lack of integration between « the socials » (fediverse accounts), blogs (but the connection of those with the fediverse is underway) and communities is what is stopping open tools like mastodon or discourse or Wordpress from being an effective alternative to Facebook.