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We're all a little bit paranoid. What happens when you fall out with someone in real life, and you can't turn to Facebook to see if they're badmouthing you. A wave of paranoia begins, and you could well be facing a huge storm and barrage of evil on the site without your knowledge. At least if you're on the site you can defend your honour.
But arguably, the biggest thing to face is social exclusion. Just because you might want to throw in the towel and give up on Facebook doesn't mean that the rest of your following or friends will. It's a symbiotic relationship; Facebook only really works if you have your connections there. If they're not, and your friends are more into texting or phoning each other, then you can do without. But seeing as nearly 1 in 11 people in the world are on the social network, it's quite likely that they are.