What you have on your Myspace or Facebook, someone can find easily.
Try this. Log out totally, search for your name. See what information you can see about yourself.
This information can be used in electronic warfare, as David Csuha discussed recently in his Security Sense blog, but also can be used in scenarios such as job hires, and often is! According to recent estimates, 20% of companies use social networking sites like Myspace or Facebook as part of the hiring process.
For example, put forth a cover letter saying how responsible you are, and a company may check up on you - Googling your full name in quotes may lead to pictures of you falling down drunk because someone tagged a picture with your full name on Facebook.
What happens if interviewers search Myspace - will they find a public blog you wrote saying "hey, I'm at work and it sucks here, but it's nice to be paid to hang out on Myspace instead of working"?
What sort of comments are your friends leaving you, and what do those things say about you?
Here are some examples of what can happen: