"Yammer was founded by former executives and early employees of PayPal, eGroups, eBay, and Tribe. It is backed by venture capital firms Founders Fund and Charle

"Yammer was founded by former executives and early employees of PayPal, eGroups, eBay, and Tribe. It is backed by venture capital firms Founders Fund and Charles River Ventures." Maybe it "won" because it has the PayPal mafia backing it...