Foursquare

Have any of you used foursquare?  It is a Social Networking Site where you use your phone to let people know where you are and certain business give discounts.  I was referred by one of the outlet malls that I go to.  It looks like a really cool app, however I do not have a personal cell phone (just a company issued one) so I won’t be able to download and use the app.  However, I would be interested in any of you have used it and your experience with it.  For those how have not heard of it this is the link to the how to video.