Click
https://sync.americanexpress.com/twitter/Index and sync your Amex card to your Twitter account.
From your Twitter account, tweet
#AmexBestBuy20 to add the offer to your syned Amex Card.
Please make sure that you receive an "@ reply" message from @amexsync stating that this offer has been added to your synced Card before you make any purchases.
Make a
SINGLE purchase of $200 or more by September 16, 2012.
A statement credit should be issued within 3-5 business days after your qualifying purchase.
Free money from AMEX