Location based services like Foursquare, Gowalla and Facebook Places help you let the world know where you are with your mobile phone. These services aren’t as popular as web email (for obvious reasons) but have managed to pull in a decent number of users in a relatively short period.
Foursquare, which is currently leading the race, has 6 million users who checked-in some 381 million times in the previous year. This check-in data is now available an interesting heat map that will help you
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