I see it more as introducing a trivial inconvenience which keeps people I know in real life generally away from my (often frank) online postings. In some sense it's just psychological, since by nature I am a very reticent person and it makes me feel like I can jot out opinions and get feedback without having to agonize over it. (That's also why I'm not necessarily comfortable directly listing out personal details which could probably be inferred/collected from what I write.)