Check it out. They haven’t set it up to be embeddable, so I just have to link to it. But it is worth hopping over there to take a look at it. They grabbed a bunch of the Social Media sites that pop straight into your mind… like FaceBook, Google+, Twitter and Pinterest… and compared them in users, revenue and employees with some that you may NOT have thought of… like Club Penguin and Tagged.
The results might surprise you. It might not alter your social media strategy (you do have a strategy, right?), but might give you some food for thought.
Social Media Ranking on Mashable.