One thing that is sure to make my wife roll her eyes in disgust is when we're out somewhere and I check in to a venue using Foursquare. I enjoy using the Foursquare iPhone app to check in, gain or lose the mayorship of a location, and occasionally get one of those cool badges that they award to users (I'm particularly proud of my Jobs, I'm on a boat!, and JetSetter badges).
The free app has just been updated and now adds two fun features -- adding photos and comments to check-ins. This is handy, since I currently have to use multiple apps to a) check in and b) send photos of delicious food to friends. Now it's all possible in one app. There's also a history page on the Foursquare website where you can see all of the places that you've visited.
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