Just came across FlockDB graph database. Details at github /flockDB. Twitter claims it uses FlockDB for the following:

Twitter runs FlockDB on a large cluster of machines. we use it to store social graphs (who follows whom, who blocks whom) and secondary indices at twitter.

At first glance, setup and trying it doesn't look straight forward. Have anyone already used it / setup this? If so, please answer the following general queries.

• What kind of applications is it better suited for? (Twitter claims it is simple and very rough, it remains to see what it meant though)
• How is FlockDB better than other graph db / noSQL db. Have you setup FlockDB, used it for a application?
• Early advices any?

Note: I am evaluating the FlockDB and other graph databases mainly for learning them. Perhaps, I will build an application for that.