For starters, here is what the FlockDB readme says:
FlockDB is much simpler than other graph databases such as neo4j because it tries to solve fewer problems. It scales horizontally and is designed for on-line, low-latency, high throughput environments such as web-sites.
As one example, FlockDB isn t capable of doing deep graph traversal because it s designed to handle Twitter s single-depth followers/following model.
The video here has a pretty good summary from the CEO of Neo Technology where he briefly mentions FlockDB: http://www.nosqldatabases.com/main/2010/7/5/need-a-graph-database-look-no-farther-than-neo4j.html
FlockDB and neo4j are quite different.
FlockDB provides distributed storage capabilities still trusting MySQL as backing storage; it is thought to query and create/update graph edges as fast as possible.
neo4j implements the full stack of storage services; it is thought to provide a comprehensive set of Graphs visit capabilities, even including a dedicated OO framework to easily write complex Graph visit algorithms.
A good introduction to FlockDB can be found here on Twitter Engineering blog.
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