Yammer is the new winner of the TechCrunch 50. It's Twitter with a business model.
"Created by an existing company, Geni, to scratch its own itch, Yammer takes the familiar Twitter messaging system and applies it to internal corporate communications. There is such a huge demand for this type of service that 10,000 people and 2,000 organizations signed up for the service the first day it launched on Monday.
"Anyone with a corporate email can sign up and follow other people in their company. But if a company ants to claim its users, and gain administrative control over them, they will have to pay.
"It’s a brilliant business model."
Read more about the competition, Yammer and the runners-up.