Some badges/achievements work for me and some don't. For instance, I'm addicted to Team Fortress 2 achievements, but I couldn't care less for them on Foursquar

Some badges/achievements work for me and some don't. For instance, I'm addicted to Team Fortress 2 achievements, but I couldn't care less for them on Foursquare or Stack Overflow. I think context is important. It makes sense to me in a real game, but not so much for a website like Stack Overflow.