Let me offer the following preface: I've only been here a few months and already feel a real sense of community. I can't wait to meet several of the people I've chatted with here in person. All of that said,
I get the real feeling that people most too much really personal information here. I only recently put up a photo of my wife and I. But I figured that anyone who was dedicated enough, not that anyone would be interested, could track down a photo of me by knowing my profession and location. However, I will not post pictures of my kids here. I may know you, the person reading this post, but I don't know that other guy reading this post. You know the one, the new member, the guest browsing, the creepy member I've never met.
I would encourage people to remember that posting here is not quiet nor confidential. It's akin to opening your window of a downtown apartment and screaming your information to the throngs of people below. Only magnify that by 10x. I can not fathom revealing some of the most intimate of details that people talk about here all the time.
I understand that people feel comfortable here and that this is a little community. Two caveats. First, what you say is here practically forever between CGC's server retention and Google's cache. It may never go away. Second, you don't know everyone reading your post.
I don't think my little post is going to dissuade anyone here from putting up a family shot of them and their kids or divulging that their wife just left them. I would just ask you to consider that there are members here who don't readily divulge specific books they are collecting for fear of having others get in a bidding war with them. Is your personal info any less important?