American Express: One-time $5 Statement Credit on $25 at Shell Oil

To be eligible to receive the statement credit:
(i) you must have an American Express Card that is synced with Twitter (see sync.americanexpress.com/twitter for more details on how to sync your Card);
(ii) you must tweet using #AmexShell;
(iii) you must receive an “@ reply” message from @amexsync stating that this offer has been added to your synced Card; AND
(iv) you must use your synced Card to make a single purchase of $25 or more at Shell by 7/31/12.