There are more recent examples but to make it interesting, I'm going to reference this TC article from last fall which uses these examples: Exec, Socialcam, Pai

There are more recent examples but to make it interesting, I'm going to reference this TC article from last fall which uses these examples: Exec, Socialcam, Pair. Exec was led by Sam Altman! http://techcrunch.com/2012/08/27/party-rounds-excellent/ http://techcrunch.com/2012/08/27/party-rounds-excellent/