Which database is used in Facebook?

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Tags

1. #distributed
2. #modified
3. #private
4. #tables
5. #store
6. #postgresql
7. #multi
8. #called
9. #messaging
10. #warehouse
11. #variant
12. #mysql
13. #dimensional
14. #supports
15. #yahoo
16. #hiveql
17. #hadoop
18. #cassandra
19. #google
20. #value
21. #bigtable
22. #youtube
23. #facebook
24. #moving