Ever followed a link to an article or blog post on Twitter, and noticed that it had a string of extra text tacked onto the end with a bunch of underscores and equal signs? It probably looked something like this: http://www.shiftcomm.com/blog/?utm_source=facebook&utm_medium=social&utm_campaign=SHIFTblog That’s a UTM code. Though a familiar friend to the digital marketer, to many…

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