Yammer is a microblogging service for businesses that aims to improve workforce productivity and connect geographically dispersed teams. It allows users to connect and share within their company using a central communication hub. Founded in 2008, Yammer now has over 50,000 networks after passing the 50,000 user mark in late 2009. While the basic service is free, companies can pay $3 per user per month for additional security and administrative features. Key features include profiles, photo sharing, activity streams, and private groups for teams.