Yes, we are still very active users of MySQL. Most of the primary portions of facebook.com are still served from a backend MySQL system (with lots of caching a

Yes, we are still very active users of MySQL. Most of the primary portions of facebook.com are still served from a backend MySQL system (with lots of caching and many other services involved). Some data is not stored in MySQL, but in other systems such as HBase (messages being a big one).