You seem to want some sort of aggregator ... ? I'm not sure facebook's the best model to start with there. I think you'd be happier with a third-party service that could receive from FB, and then we wouldn't get into forcing facebook to carry stuff.
I don't want to force FB to do anything. I want to require all social media companies to allow aggregation (though ActivityPub etc) but if Zuckerberg/Facebook decide they don't want to be in that industry, I would have no problem with them simply closing down.