Did you know that Twitter is the social network with the strongest growth rate in 2012, ahead of LinkedIn, Pinterest and Reddit?

Facebook? That didn’t even make the cut. Still, when you’re closing in fast on one billion users, your annual growth rate does tend to slow down a smidgen. Still, don’t shed a tear for Mark Zuckerberg – save those for the owners of Digg, Bebo, Friendster and, of course, MySpace, who are the four social networks most in decline, reminding us that success in this space can be both dramatic and fleeting.

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