location based social media

I am starting to look at how location based social media works, using the app foursquare I am looking at how this can be used with various businesses to look at grabbing people as well as finding out what works and what doesn't.
One of the things I am doing is adding places, like my school, so I can see how it works as well as gaining interest from the students in using it as an attendance tool to see who will be mayor of our school, wonder if I can wind my classes with there iphones and itouches when we have our wireless system up and running. would be interesting to see who will topple the mayor. I like challenges :)