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Article:

10 Ways to Avoid Office Politics

How to Keep a Low Profile & Stay Out of Office Gutter Politics

9. What They Don't Know Can't Hurt You

It's great to have genuinely close friends with whom you also work. But if, like most people, you're not that lucky, it might be best if your coworkers know enough about you to be able to have a friendly conversation, but not so much that any information they have could hinder your advancement. While socializing outside of work can help you advance your career, be careful -- one too many drinks and your coworkers have some dirt on you. 

Consider implementing a "work friends" privacy setting on your Facebook page if you'd like to friend your coworkers on social networks.