The MySpace website is trying to keep young teens who use it safe by warning them about potential online dangers.
The popular site, which has also appointed a security expert to oversee its younger users, had been criticised for not doing enough to protect kids.
MySpace members can set up personal profiles, including pictures, which can be searched by any of its 69m users.
Only people over 13 can join, and kids aged 14 and 15 have special protection.
However, it's thought lots of kids get round these obstacles by lying about their age.
That means they could be at risk from people who are lying about their own personal details and might want to harm kids.