diaspora*

diaspora* is a decentralized social networking platform that puts users in control of their own data. Instead of a central company owning everything, it runs on a network of independent servers called pods, each hosting its own community. You pick a pod, create an account, and then share posts, photos, and messages with people on any other pod. It works a lot like Facebook or Twitter, but without the ad tracking or algorithm manipulation.

The software is built with Ruby on Rails and uses a MySQL or PostgreSQL database. It supports federation through the Diaspora protocol, meaning pods can talk to each other seamlessly. You can integrate it with services like Twitter and Tumblr for cross-posting, and it includes features like aspects for organizing contacts into groups, private messaging, and markdown formatting in posts. The project is maintained by the Diaspora Foundation and runs on Linux servers.

diaspora* is best for people who want a social network that respects privacy and avoids centralized control. It is free and open source under the AGPLv3 license. Anyone can set up their own pod or join an existing one. The project has been around since 2010 and remains a solid choice for decentralized social media enthusiasts.