American Airlines: FREE AAdvantage Miles

American Airlines is giving away 100 to 100,000 AAdvantage miles for Free after you "like" them on Facebook. If you don't have an AAdvantage account you can create one before you play and also get an extra 1000 bonus miles with the code: HIS10. Miles will be deposited into your account within 3-5 days. Offer expires March 31.

You can also enter their "Vacation a Day" giveway.