This. I draw a line between 1) sites where the author of some content is very visible and 2) sites where you need conscious effort to check out who wrote someth

This. I draw a line between 1) sites where the author of some content is very visible and 2) sites where you need conscious effort to check out who wrote something (like reddit, HN, wikipedia). The former is social media. The latter is just web 2.0.