I would like to add that Facebook is almost required if you are on a college campus, myspace not so much. I'll admit it is almost like a drug. Facebook is my homepage, I check it many times a day and I am in the norm. Those who don't have one are essentially considered weird. It is the ultimate stalker website as well. You can see who went where, what they did, who they hung out with, what they like and dislike; it is extremely invasive. I would consider it worse than myspace but the thing is it still is mostly centered for college, high school age so you guys don't have to worry about it. But this could soon change so be careful. It's rising in popularity fast!
I mean in today's age, the pressure to have a myspace or a facebook is very immense so kids will go to great lengths to have one and hide it if it is not allowed. I know of a few kids who do this. More than likely your teen as atleast tried to make one or is involved in it some how.
"Accurate Facebook Mini-Feed" by Jeff Rosenberg on CollegeHumor
Here is a funny article about Facebook but in all reality it highlights what happens on the website. I found it really funny yet disturbing at the same time. Enjoy!