April 2010: Groupon valued in the $1.35b range: http://techcrunch.com/2010/04/18/its-official-groupon-announces-that-1-35-billion-valuation-round/ http://techcr

April 2010: Groupon valued in the $1.35b range: http://techcrunch.com/2010/04/18/its-official-groupon-announces-that-1-35-billion-valuation-round/ http://techcrunch.com/2010/04/18/its-official-groupon-announ... January 2011: Groupon values itself in the $15b range with an IPO: http://dealbook.nytimes.com/2011/01/13/groupon-readies-for-an-i-p-o/ http://dealbook.nytimes.com/2011/01/13/groupon-readies-for-a... Hmmmmm....