Recently I was looking into location base community, Foursquare is one of them. Foursquare started to look into oust the mayors with invalid check-in.
Foursquare is a location base community website, which allow Foursquare users to 'check-in' a hotspot and publish to their friend or to the public.
Foursquare (and other similar website) not just making the web services as a community, but as a games as well. As you check in more hotspot, you collect points. The most frequest user check in to a hotspot became the mayor of the hotspot. The mayor may get some discount for the hotspot.
Internet is an virtual world, there are a lot of fake id, rumors, predictions floating around. All these information can not be trusted unless it came from trusted site or can be verified. Is not surprise that Foursquare users can check in to a hotspot without actually going to the place.
Let's see how Foursquare will address the fake check in issues.