I'm going to attempt to write this review as objectively as possible, but first I think it's best to include a little bit about myself.
I'm very into social media and do a lot of different social media marketing / inbound marketing for a few online businesses. So naturally I'm very involved with Twitter / Facebook etc (and why I signed up for this site)
Okay onto foursquare... if you haven't heard of foursquare it's a social network that encourages you to go out and explore the world. Using mobile location technology users check in to different locations.
Checking in earns you points and by checking in you can earn various different fun badges that display on your profile. For example during the Preakness (2nd part of the triple crown of racing) I got the swarm badge for checking into a place with 50+ people checked in.
The site encourages you to earn new badges and explore the world. Different tourism boards have jumped in like VisitPa.com and award users badges for visiting different places in the State.
The other major piece is mayorships. You become a mayor of a place when you have the most check-ins at that location. It's fun to battle for the mayorship of different locations like your local Starbucks who used to offer a discount to their local mayor.
Foursquare is a great fun product of the web and if you're socially connected and not afraid to share your location join up!