Week of Fri, 28 Sep 2012 00:00:00 Z

Marketers have often tried to calculate the value of a tweet without ever really reaching a consensus. A recent campaign from Kellogg's has figured it out as far as their company is concerned. The answer? A bag of Special K chips. A pop-up store in London to help launch the new product line lets users tweet phrases using suggestions from a menu board in exchange for a free bag of chips.