I'd disagree, Facebook is a great counter point to the "another startup of Microsoft/Google is unlikely". Every 2 years now software seems to be going through h

I'd disagree, Facebook is a great counter point to the "another startup of Microsoft/Google is unlikely". Every 2 years now software seems to be going through huge shifts (web => web 2.0/Cloud => mobile....). With each transition there is a chance to create another MSFT or GOOG.