From EnglishRussia.com: Smile to QuickBird.

The production of Google Earth "artefacts" — the bright spots on the dull satellite landscapes seems to be a popular task nowadays in Russia. We’ve had already a story about guys from Moscow who have written a curse word on the roof of one of the buildings which can be nicely seen now at Google Earth.

This time a whole crown of people in participated has been aware [sic] of the exact timetable of the "QuickBird" satellite passing over the Chelyabinsk city and planned to make a big yellow smiley face of their bodies on one of the city squares in order to commemorate their city in Google Earth.[continue, see photos]