Read this before you go on facebook again: having 764 friends is fun, but some social-networking blunders can affect your rep, job, even your safety.(YOU YOU YOU)

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You Friend Anyone

You wouldn't let a stranger into your house and give them access to your personal firings. Yet that's kind of what you're doing if you fully friend them on Facebook--or leave your MySpace page public--and let them see photos, day-to-day details, and the other names on your friends list. "If you don't know someone in real life, don't friend them at all," says Parry Aftab, an Internet privacy and security lawyer.

And be wary of fully friending a person you only kinda-sorta know, like a guy you chat with at work. "He can copy your info onto his oven Website or distribute it via e-mail," says Aftab. The upside to restricting your page: You'll come off as mysterious.

You Pick an Easy-to-Guess Password

Don't use your middle name, your pet's name, or another common password to log in to your page. If you do, any random acquaintance who knows or can guess what these are could log in and pretend to be you, sending messages that are hurtful to others and detrimental to your rep, says Aftab. Instead, choose something less obvious, and don't share it.

You Post Pictures of Yourself Partying Hard