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Where can I read more about the custom things FB added to MySQL 5.6? Their work on replication and the DDL work seems fascinating. Are there scholarly papers, white-papers, blogs?

Are they storing the friend graph in MySQL?

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Direct source is available at:

https://github.com/facebook/mysql-5.6

The social graph is indeed stored in MySQL via TAO. A recent white paper about MyRocks is:

https://research.fb.com/publications/myrocks-lsm-tree-databa...

there's also this team page, although it has been somewhat lower on volume lately - https://www.facebook.com/MySQLatFacebook/

I've not got a FB account due to reservations about FB and their business model but that doesn't mean I am above learning from what they do, thanks for the link, I'll have to find info elsewhere though.

I don't think you need a FB account to read the posts there, you can just treat it like a blog with a crappy interface (but very good content). Probably some mandate to "eat your own dog food".

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