George ZacharyYammer, Inc.
Yammer is a tool for making companies and organizations more productive through the exchange of short frequent answers to one simple question: ‘What are you working on?’
Yammer was founded by former PayPal COO David O. Sacks and officially launched on September 8, 2008. Yammer’s management team includes seasoned industry veterans drawn from the ranks of PayPal, eBay, eGroups, Tribe, and other leaders in the software industry.