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Ubuntu Unleashed 2013 Edition: Covering 12.10 and 13.04, Eighth Edition by Matthew Helmke

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FlockDB

FlockDB is used by Twitter to store social graphs, such as who follows whom, and for some secondary indices. It is free and open source, using the Apache 2.0 license. It is simpler than other graph databases as it seems to try to solve fewer problems, being designed for one primary use. FlockDB is designed for online, low-latency, high throughput environments such as websites like Twitter; even then, it’s only for storing specific types of data.

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