This document discusses enterprise microblogging and the use of Yammer within companies. It provides an overview of microblogs and how they differ from traditional blogs. Enterprise microblogs are internal networks that are more secure than public social networks and allow file sharing, communities and other collaborative features. The document examines trends in Yammer usage including using direct messages instead of email, searching for content, and using groups. It provides screenshots of the Yammer interface and discusses best practices for implementation within companies.