Through November 15, 2013, American Express cardmembers can receive a one-time $10 statement credit after spending $50 or more at Lowe’s either in-store or online. Enrollment for the offer is limited and does require a Twitter account.

To be eligible to receive the statement credit:

• You must first sync an eligible American Express card with Twitter (see sync.americanexpress.com/twitter for details). If you are completely new to Twitter, you can read this post to find out how to get started.
• Send a tweet that contains hashtag #AmexLowes from your synced Twitter account
• After you have tweeted #AmexLowes, you should receive a response message from @AmexSync stating that the offer was successfully added to your American Express card
• Once you have received the message, you must use your synced card to spend at least $50 at Lowe’s in-store or online by 11/15/13

Full terms of the offer can be found here. Note that e-gift cards are excluded from this offer. Your statement credit should appear within 8 weeks after Amex receives confirmation from the merchant of your qualifying purchase.