I don't claim to be a social media expert by any means, but since it's a way of marketing a business (which is part of what I help my clients do) and since it also involves content development, I think this infographic will be perfectly at home here.
Plus, it's interesting as heck--at least it is if you use email, participate on Facebook, post on Twitter, look up stuff on Wikipedia, etc.
And sorry that this takes up a majority of the right-hand column...I'm not sure how to fix that yet!
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