Long GOOG, Short Facebook, LNKD, and Groupon

From a great article about the valuation of Groupon:

If Facebook is worth $70 billion and if Groupon's price jumps to $40 billion soon after trading begins, and if LinkedIn recently traded at a value of more than $7 billion, then those three companies combined are only a couple of weeks of giddy trading away from overtaking Google's market value of $138 billion, net of its cash and debt. What's odd about that? Google is a financial giant. Its sales are double those of companies like The Gap and General Mills. If the other three companies have a humdinger of a year this year, they'll match Google's sales -- from back in 2004.