Being something of a social media nut, I tend to go gaga over any new tools, studies or services that pop up online. So gaga, in fact, that when a Twitter follower of mine mentioned something about a free social media book hitting Kindle stands online, I just had to grab it. It's called Zarrella's Hierarchy of Contagiousness: The Science, Design, and Engineering of Contagious Ideas.To my delight, it was written by one of my favorite social media experts online, Dan Zarrella — a figure whos [...]

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