Isn't that kind of the point? You don't get very far hiding in a social setting. You're on a public website talking to other people. Your posts should be public, comments, etc. At least people should treat all websites or apps they didn't develop personally like they're public. I mean you don't really have a right to privacy in public.
And I'm not trying to say this with some malicious tone or anything but it's just my view on it.