The last location-based service we are reviewing this week is Foursquare, "4sq" for short.

According to the buzz on the street, during the last 7 days both Foursquare and Gowalla have to worry about Facebook Places. We explained our position on the substandard Facebook Places yesterday, and Gowalla has a really cool interface that we explained 2 days ago.

Foursquare is not snazzy looking, but it's fast, has real time updates, interaction between users and 3 different types of social competitive scenarios.

They really have their act together.

Here are some of the features that wow'd us:
* Check in at the same location enough times to become the "Mayor" of that location. Compete against your friends.
* Check in at different locations, different times of the day, and at specific events to be awarded "Badge...
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