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Facebook Chat could well be the world's largest chat protocol, as the number of available users surpass that of ICQ and Windows Live Messenger. And considering it is so widely available as an open protocol, anyone with a smartphone can download an application to contact their friends on the go.
So if you jacked in other instant messengers to keep all of your social activity all in one place, then you will be missing out. Then again, so many people 'turn off' Facebook chat anyway, so they cannot be bothered, one might question whether it is as popular as one might think.
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.