It was 6000 in the original airdrop, and after that there was an airdrop against bitcoin addresses in a proportional fashion (only if you chose to claim them, if i am recalling correctly.)
There was one where you signed up with Facebook and got 5k too. I got quite a chunk of change by getting all my friends to log me in with their accounts.
There was a guy who scripted himself a huge number of the facebook giveaway airdrop. I have vague recollections of his hoard being invalidated via a hard fork or some other method!
