Link: CitroŽn Seekers

Thousands of virtual CitroŽn DS3 Cabrios have been released into a map of the UK. Using the streetview interface, you must navigate around streets, finding and collecting as many DS3 Cabrios as you can. The more you find, the more points you collect and the greater your chance of winning your very own CitroŽn DS3 Cabrio!
How to play and terms and conditions at the supplied webpage [above]

Required: Facebook account.