This post originally appeared on the Buffer blog. A quick glance at a chart of_the Internet’s fastest-growing social networks_reveals what you likely already knew (Instagram is growing like mad) and what might be a surprise:_LinkedIn is the third-fastest-growing social network. We at the Buffer blog can vouch for LinkedIn’s growth as our blog has experienced a swell in LinkedIn referral traffic over the past year, up 4,000 percent from last year at this time. Part of that has to do with our emphasis on updates and sharing at LinkedIn, another part has to do with the popularity of LinkedIn contributing...

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