Once you tweet that confirmation hashtag, American Express will shoot you a confirmation e-mail and give you 15 minutes to confirm you want the product.

CNN: Twitter and Amex to let you pay with a hashtag

Someone in my office would manually send out a confirmation e-mail.

FORBES: Quicker, Better, Wiser

Apple touted the service's ability to recognize when you're messaging someone else eligible for iMessages, but it appears to be limited to e-mail addresses at this point in the BETA. Delivery confirmation is turned on by default, but those of you who don't like the thrill of the chase will be happy to learn that there's an option to disable read receipts.

ENGADGET: Apple iOS 5 hands-on preview