Combining social media with real-world interactions, KLM has launched a very innovative campaign in which it randomly surprises its passengers at the airport. In what the airline calls 'an experiment on how happiness spreads,' KLM has installed a ‘Surprise team’ for four weeks at Amsterdam Schiphol Airport which aims to delight passengers that have checked in at KLM venues on location-based social network Foursquare with little acts of kindness.’