GNU social (previously known as StatusNet and once known as Laconica) is a free and open source software microblogging server written in PHP that implements the OStatus standard for interoperation between installations - wikipedia 
While offering functionality similar to Twitter, GNU social seeks to provide the potential for open, inter-service and distributed communications between microblogging communities. Enterprises and individuals can install and control their own services and data.
GNU social has been deployed on hundreds of interoperating servers.
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