We're often told that it pays to be positive, but it has never been truer than in the attitude test conducted by the Coke Tweet Machine. In its research, Coca-Cola found that people in the city of El Prat de Llobregat in Spain are some of the most negative on Twitter—roughly each positive tweet sent is countered by a negative one. As a city that's in the midst of a harsh economic crisis, it's no wonder that the people have something to gripe about.
In order to get these Spanish citizens to lighten up, a unique vending machine was set up. The Coke Tweet Machine follows a user on Twitter and instead of charging a fixed price for a fizzy drink, it analyzes previous tweets to gauge positive or negative a person is; positive people payed less and negative people could expect to pay more. Since Coca-Cola is a brand that always strives to promote happiness, this campaign really challenges people to change their perspective, at least for the sake of their wallets.