SEPTEMBER 20, 2008
Yammer is like a private Twitter. Instead of Twitter’s question, “What are you doing? , Yammer asks “What are you working on?. Yammer also serves as a company directory in which every employee has a profile and as a knowledge base where past conversations can be easily accessed and referenced. Anyone in a company can start their Yammer network and begin inviting colleagues. The basic Yammer service is free.