I think this is very cool. Good one KLM - and big thanks to Andy Headworth who posted it on his blog - read the full article here:
http://blog.sironaconsulting.com/sironasays/2012/05/brilliant-how-foursquare-and-twitter-were-used-to-make-random-people-happy.html
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Royal Dutch Airline KLM made an exciting campaign to connect with their customers called KLM Surprise at the Amsterdam Schiphol Airport. They tracked down "how happiness spread', the campaign involved surprising travellers with unique gifts based on their social networking profiles. Watch the video to find out more.
Charlie Elise DuffI really liked how they personalised the surprises according to their publicly-listed interests.