From their website:
Check-in to places
So, how could Four-Square be used effectively for political advocacy? Take a look at the K Street Cafe Blog for a few ideas from their contributors.
People use foursquare to "check-in", which is a way of telling us your whereabouts. When you check-in someplace, we'll tell your friends where they can find you and recommend places to go & things to do nearby. People check-in at all kind of places - cafes, bars, restaurants, parks, homes, offices.
You'll find that as your friends use foursquare to check-in, you'll start learning more about the places they frequent. Not only is it a great way to meet up with nearby friends, but you'll also start to learn about their favorite spots and the new places they discover.
First, Amanda Phraner suggests calls to action around "check-ins." Read her piece here. Next, Alan Rosenblatt suggests the concept of a virtual flash mob via the a similar tactic. Find his take here.
Either way, the creatives out there will find a way to use this fun new platform for advocacy. I'm looking forward to the possibilities!