In 2010, Twitter was using a graph database, FlockDB, instead of a relational database to implement their social graph where relationships like following and fo

In 2010, Twitter was using a graph database, FlockDB, instead of a relational database to implement their social graph where relationships like following and followers are represented as edges between nodes that represent people. It's since been deprecated, and I'm not sure what type of database they're using today. Anyway, they have a nice write-up blog post [1] and FlockDB is open source [2]. [1]: https://blog.twitter.com/engineering/en_us/a/2010/introducing-flockdb.html https://blog.twitter.com/engineering/en_us/a/2010/introducin... [2]: https://github.com/twitter-archive/flockdb https://github.com/twitter-archive/flockdb