if you believe that Facebook is worth $15 billion. Facebook is usually valued at $4 billion. http://blogsearch.google.comq=facebook+valuation+%224+billion%22&s

if you believe that Facebook is worth $15 billion. Facebook is usually valued at $4 billion. http://blogsearch.google.comq=facebook+valuation+%224+billion%22&scoring=d http://blogsearch.google.comq=facebook+valuation+%224+billio...