I don’t know when it happened, but I recently noticed a change Foursquare made that totally simplified what once required thought.
I remember using an early version of the app that had an explicit distance filter. As in, if you’re searching for coffee, choose or enter a numerical value for the area you want covered. OK, it’s not THAT complex a load for your mind to handle, it was just kind of annoying to be that precise, or give the perception that you needed to be. Don’t make me think, and all that jazz.
Now I get a much more tangible distance filter. A map.