StatusNet is an open-source microblogging platform that allows users to create and host their own social networking sites. It was designed to facilitate public and private communication, similar to services like Twitter, but with more control over data and privacy. Users can post short messages, follow each other, and interact in a decentralized manner. The software supports various features such as hashtags, groups, and attachments, and is built to foster interoperability through standards like the OStatus protocol. StatusNet's platform is customizable and can be tailored to fit the needs of individual communities or organizations.