Yammer raises $17M from former Facebook VP to improve enterprise social networking

Since its launch in 2008, Yammer has made incredible gains with enterprise users, with more than 3 million verified corporate users and more than 80 percent of companies on the Fortune 500 list using the network. It has attracted more than 100,000 businesses in 160 countries. The service tailors Facebook and Twitter-like communication strategies to give businesses activity feeds, private messaging, polls, Q&A and more.