After I read on Mashable that a firm had valued Facebook fans at $3.60, I cringed. How can you value a fan? All fans are not created equal. It comes down to who is interacting with your page, and how. Not the sheer number/quantity of fans.
This site may be a little rough around the edges, but Khan gives video tutorials about everything under the sun. He is an insanely smart MIT/Harvard MBA grad and good at what he does! So go learn something, and get smarter!