More than a quarter of eight to 11-year-olds say they have a profile on a social networking site, a survey of kids has found.
Researchers discovered that lots of you are using sites like Bebo and Facebook, even though most sites have a minimum age of around 13 to 14 to use them.
People running the sites say they take down the profiles of people found to be too young to use them.
But experts want even more security settings put in to protect kids.
They also want parents to learn more about what their children are doing online.
Thousands of children were questioned to find out how social networking sites are affecting their lives.
The survey was carried out by Ofcom, who keep a check on what is shown on TV, radio, and the internet.
People running the three leading networks, MySpace, Bebo and Facebook, say they take off any profiles of users that are found to be too young.