Kellogg's Pop-Up Store Lets You Pay for Snacks With a Tweet

The exact value of a positive tweet about a brand has been officially pinpointed: It's worth a bag of new Special K chips. At least, that's the going rate at the new Kellogg's Tweet Shop in London—a pop-up store that's giving away bags of the new product in exchange for a little love on Twitter. Visitors to the store can pick out one of three prefab tweets to send—or they can come up with their own, which might be less informational but could seem more authentic, too.