I found one of my children's teachers on Facebook quite by accident (friend of a friend) and found out quite a lot about her as she had no restrictions with privacy, so basically anyone can look her up! She was also very rude about all the crap she gets from parents as Xmas presents (which she is entitled to of course but as long as it is done only to her friends) and criticising parents.
Since then I have found loads of teachers from the school who are on FB with no privacy settings at all. Shouldn't teachers have enough sense to restrict their profiles? Are they really so ignorant or just plain stupid! It's not that hard to do it!