Autobiopic is a Google Maps based tool to visualise your Foursquare check-ins. The application allows you to animate your recent check-ins on Foursquare and return the distance you have travelled.
Autobiopic has now developed a very cool visualisation tool called Autobiopic CityLinks. This new visualisation tool uses Google Maps to measure the connectivity between cities based on the number of visitors to Autobiopic who have checked into both of those cities.
If you enter a city into the search box you can view a map showing you the connectivity of Autobiopic users. The map shows where people from the city travel by drawing a line from a check-in made in the searched city to other cities that the Foursquare user has travelled to.
There are already 1,500 cities in the CityLinks database so you should be able to view a CityLinks visualisation for most of the major cities around the world.