A fight or conversation that happens to be overheard by someone in public is different from something you intentionally broadcast on an online profile for all of your friends to see. Your nosy neighbor doesn't look over your fence and then post his findings to YOUR Facebook profile. Online profiles are collections of information that people CHOOSE to broadcast about themselves to anyone they like. With the news feeds, the only people who see this information are the people who already had access to it, and the only information they see is the information you chose to share with them. If it seems creepy, then maybe you're sharing too much information.