Youngsters in danger
A study of social networking sites like Facebook, Bebo and MySpace has found that kids as young as eight are giving out their phone numbers and addresses.
The report was done from Ofcom - they're the communications watchdog.
They reckon parents haven't got a clue what their kids are putting on the sites.
There's worries that paedophiles could be looking at young peoples profiles.
Ofcom say 4 out of 10 of us don't protect our privacy enough on social networking sites, they recommend not putting your personal details, like your mobile and address on there.