The biggest difference between FlockDB and other graph databases like Neo4j and OrientDB is graph traversal. Twitter’s model has no need for traversing the social graph. Instead, Twitter is only concerned about the direct edges (relationships) on a given node (account).
Without traversals it is only a persisted graph. But not a graph database.
This blog is called myNoSQL and it is written by me, Alex Popescu, a software architect with a passion for open source and communities.
It records my readings, learnings, and opinions on NoSQL databases, polyglot persistence, and distributed systems -- subjects that I'm passionate about.
The opinions expressed here are my own, and no other party necessarily agrees with them.
If you feel I'm biased, I probably am.