protect your self on facebook....

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Love them or hate them social networking site like facebook are here to stay...Like so many people of others i have found facebook in the last few month...But what started as idle curiousity soon grew into addiction....as seen on http://journal9.yolasite.com/ how about the security of every User id?are there any hacking technic on facebook?...and most importanly...how to prevent our IDs?