The social media scene should be fragmented. The fact that everything became so centralised was a problem, and became weaponised. Too many people see these things as necessary to get a singular "good" message out, but a monoculture is unhealthy regardless of how well intentioned the message is.
What fragmentation means is that now sites need to put more effort in getting an audience. No more posting on Twitter/Facebook and watching the clicks come in. The flip side will be a better diversity of opinion in discussions and a healthier community.