How many social networking sites are there? Does anyone really know? How in the world are we supposed to know which ones to join? Sure, we should probably join the major ones that pop into most everyone’s mind (Facebook, LinkedIn, Pinterest and Twitter just to name a few) but what about sites like Biz Sugar, Blog Engage and Triberr? Aren’t those important social networking sites too? How do you determine which sites fit best into your social media strategy?