Nick Kallen at Twitter last night released FlockDB, Twitter’s social graph database. Source code is here.
If anybody doubted that graph databases are real, or are useful, this release is yet another good reason to investigate. Welcome FlockDB to the crowd.
I haven’t had time to take a detailed look, but it appears that FlockDB has a hard-coded schema developed specifically for the needs at Twitter. That makes a lot of sense for Twitter but less so as a general-purpose graph database. On the other hand, lots of people could probably benefit from that schema when building social applications. We’ll see.