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Starbucks is using Twitter to gift coffee. Tweet-a-coffee allows you to send $5 gift cards with a single tweet to anyone you desire. After signing up on the Starbucks site, all you have to do is reply @tweetacoffee before the username of the person receiving the gift. To redeem the certificate, the recipient just has to show the link to the cashier who will then scan the bar code. The first 100,000 people to participate in Tweet-a-coffee will recieve a $5 gift card from Starbucks. Eater National has the promo video. [-EN-]