The main difference in my eyes is that its relatively easy to evaluate a business that bases revenue off sales of tangible goods. Twitter and Facebook are a muc

The main difference in my eyes is that its relatively easy to evaluate a business that bases revenue off sales of tangible goods. Twitter and Facebook are a much harder valuation because there isn't a clear standard way of evaluating them. Evaluating them is not the same as evaluating google, even though they are both in the online advertising biz...