Don t give out personal information, including your picture. You do not know who will get this. Always trust your instincts. If you do not feel comfortable giving out information, then don t. Always check with your parents before sending your picture.
Many sites use passwords.
If you have to choose a password, make sure it is one that would be hard for other people to guess. Remember, you cannot see the people you talk to on the Net. They may not always be what they appear. Adults can pretend to be kids. If a friend on the Net wants to meet you, make sure to get your parents permission.