KLM rewards their customers with gifts.
The airline is aware about the growing needs among consumers to be noticed. Especially at public places, like airports were millions of people commute on a daily basis, the possibilities are endless.
How it works:
Once you checkin via foursquare at an “KLM” airport, it’s likely that you will be approached by the @klmsurprise team. This “loyalty-team” will perform a fast check on your preferences and hobby’s on Facebook and Linked-in in order to determine your reward.
True example:
A fan of the Dutch soccer team PSV EIndhoven would miss the game against the current Dutch champions FC Twente, as he would stay in New York. He clearly discussed this matter on Facebook and the @klmsurprise team therefore handed over a Lonely Planet book with all the sports-bars in NY to watch the game.

More examples can be seen on Facebook, but I definitely became a fan of KLM as they underpinned the importance of the statussphere and the specific need in the current market..
Geotoko was already discussed, but this movie clearly shows step by step how it works. Enjoy!
It will thus certainly be a tool that I will use for the social media campaign in a Dutch supermarket, but where…….;)