One of the scariest things about Mommy Facebook Groups is how much personal information people are willing to share on them. I'm convinced that so many of these moms never learned that creepy people can use what you post online stalkingly. Either that, or they don't think it will happen to them. It's one thing to share something vaguely identifying anonymously, but it's a whole different story when you're sharing details about your life and your child's life with a group of functional strangers…