How do you feel about folks airing their dirty laundry on Facebook or other social networking sites?

Last week I asked this question regarding my ex using his since closed Facebook account to bad mouth me. Then last night I saw a status update from a friend with a surprise pregnancy. She was announcing the big news and in the process begging anyone who knows the father father, who wants nothing to do with the baby and who also has a Facebook account, to change his mind. I really like the woman who made this post but the whole idea of putting it out there made me very unsettled. What are you feelings about this type of thing? Full disclosure: While never going to that extent I have shared feelings of frustration in my facebook status.