I find it useful to distinguish between social networks (based around people/accounts; e.g. Facebook, Twitter) versus forums (based around topics/posts; e.g. Re

I find it useful to distinguish between social networks (based around people/accounts; e.g. Facebook, Twitter) versus forums (based around topics/posts; e.g. Reddit, myriad phpbb instances, etc.). HN is more of a forum than a social network.