Today starts the (Red) Rush: Starbucks to donate $250,000 to (Red) if customers check in on Foursquare.
Foursquare is a kind of location-based social media. You use your phone and use a Foursquare app to find your location, and then click “check in.” It is important to know that you can check in either privately, or publicly. You can broadcast your check in via Twitter or Facebook, or instead check in privately. Only your friends (meaning those whom you have approved to follow you on Foursquare) can see your location. The person who checks in the most frequently at one location is crowned the “Mayor” of that location.