I think this premise is incorrect. Not many people remember but in the first few months after the launch of Twitter, it used to be a nice place for geeks to hang out and share the next interesting hack they were working on.
Then the network effects kicked in. Then celebrities came in. Then their followers came in. Twitter became a melting pot where every Tom and Harry now had a voice. Guess what that did to the platform. The place became full of noise, trolling, flame wars and spam.
Why do we want network effects for every new social media? Can't we leave them small and homely?