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It's getting to the point where you're at a disadvantage if you don't have a Facebook account; you can use it to log in with the same username and password on more than two million sites -- it's not just for checking in on your cousin's newest baby pictures.

You can go completely invisible on Facebook -- nobody will be able to view your photographs, see your activity or where you've checked in except for existing friends -- but still have an account to use around the web.