[TeMPOraL]

That's like saying a nation is one community. It's not. It (usually) shares a language and some common values, but otherwise there's greater diversity within a nation than between nations.

Still, there's a lot of truth in "When you say X sucks, You're really saying that your friends / the people you're following / the communities you visit suck". It literally takes seconds to join or leave an on-line community. On the Internet it's more true than anywhere else that you get the communities you deserve.

[skinnymuch]

FYI That's OPs point. They are saying all those social media sites are the same to prove the point that they aren't. As evidenced by their next paragraph.