One in three small businesses are using social media and, as this number grows, a social media presence has become something that customers have come to expect. But for businesses that have yet to dive in to the social media arena, it can be a little bit overwhelming. How do you know which networks you need to build a presence on and how do they work? A handy-dandy cheat sheet (a.k.a. infographic) showing the ins and outs of the social media ecosystem has become all the rage.