Foursquare is a smartphone app encourages people to get out and enjoy their city by sharing check-ins, tips and to-dos while earning points and badges as they explore new venues and favorite hang-outs. Foursquare can also be used in education, though, for online students, lower education teachers, and in campus communities. Read on for great ways to use Foursquare in education.
http://www.accreditedonlinecolleges.com/blog/2010/30-ways-to-use-foursquare-in-education/