[johnrob]

Any app/website with a large user base should probably add this feature. The main value here, compared to simply dropping an ecommerce link in a tweet (the current use case), is piggy backing payment and fulfillment on top of the existing twitter user account.

[mahmoudimus]

Would be interesting to see how these things develop -- fulfillment and payment processing are double-edged swords.

Bolting on fulfillment to a twitter-purchase seems like a lot of work, but as another commentator said, I'm cautiously optimistic.