I like Buzz after using it a bit more on my iTouch (still not available on my computer yet ... :/ ). Still trying to decide if I like Buzz better than Foursquare. It's really fun checking in and competing with your friends, but if you don't live in a populated area like myself, there seems to be not as much interaction. When I signed on with Buzz, there were already people interacting. Sharing tips about restaurants, what they were doing for the day, how they liked Buzz, and etc. Both are definitely fun though! Anyone get to use it on their PC? How is it??