Something I didn't know until today: the Facebook API includes a complete SQL-style query language for querying one's social graph, which allows you to do things like:

SELECT name, pic, status, music FROM user WHERE uid in (select uid2 from friend where uid1 = 1234567890)

FQL, as it's called, can be called from the Facebook API, or you can play with it here (using the fql.query method).

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