Facebook and adoption

Our kids' birthmother posts pics of them every once in a while. I feel that she's just proud of them. We have a good, but relatively distant relationship. The only thing that does bother me a bit is that she has 700+ "friends", so total strangers are seeing these pics. The pics were copied off of a website that we maintain for her. So, they're pics we took. So, I would not bother having them removed, but it does bother me that people we don't know are seeing the pics, and many of the people she knows are a bit insane. But what is the worst that could really happen? Probably not much?