Social networking sites are a common place for people to share pictures of their families, but if you're one of the 40 percent of users who don't restrict access to your profile, then those pictures are there for everyone to see. It's a sad fact, but there are a lot of predators who use the Internet to stalk their prey. If you post pictures of your family and couple that with information like, "my husband is out of town this weekend" or "little Johnny is old enough to stay at home by himself now," then your children's safety could be at risk. Nobody ever thinks it will happen to them until it does, so safety first is a good default mode when using social networking sites. Just like with other private matters, send family photos only to a select group of trusted friends and colleagues who you know won't share them.