My four eldest all have a FB profile. They love the games and frankly, FB privacy and security settings are better than Bebo and Myspace - the other two places they could play those games. You can't even find my two youngest by searching for them and their names are linkless black text on mine and my families profiles. The youngest two barely know how to navigate FB and ask me to bring up the game they want anyway.

When it comes to what they are doing online and keeping them out of trouble, I use keeping the computer in a 'communal' room and Live Family Safety.