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[danathompson]

It's important to have different passwords across all accounts. Always use alpha-numeric passwords as they are difficult to guess. It is difficult to remember so many passwords, that's why I use Billeo http://www.billeo.co...sitename=Billeo It manages passwords and has other nifty features like saving receipts and auto filling forms.
Go to the 'privacy settings' tab on your account(s) and make sure your profile can be viewed by friends & family only. Exercise caution while accepting friend requests from strangers.