Instead of checking in to a location (though you can do that too, if you link your existing Foursquare account), you check in with what you’re watching. Miso keeps track of your check-ins and rewards you with badges relating to specific genres (and sub-genres) of film and television. Link your Twitter or Facebook, and suddenly, you’re posting what you’re watching with friends and seeing what movies they’re watching as well. Genius.
iPhone/iPad-only for now.