Social media as it is now ("connect everyone together") is definitely a bad idea. Communities of people only work when they're close knit or share an identity,

Social media as it is now ("connect everyone together") is definitely a bad idea. Communities of people only work when they're close knit or share an identity, not when you have mash-ups of different people in different communities all randomly tied together and forced to address each other's opinions. You might as well have a barbeque where Hell's Angels, an LGBTQ support group, and a Catholic church study group all sit in a circle for no reason. Online groups only work when they have a uniform identity, an ingroup, a particular set of shared values. They can have other ideas or values, but it needs to be clear to them that they should only bring up that group's values. Communities can also be toxic and stupid, but they do keep cohesion when they're all aligned on a core theme.