Foursquare has gathered a year's worth of check-in data from all over the world and made it into these cool time-lapse maps of the activity in major cities.
To me, they look a little like a swarm of fluorescent bees descending on a city, feasting on it and then fading away. But they are definitely a neat example of what can be done with volunteered information collected from mobile apps.
It's also interesting that Foursquare has enough users in places like Tokyo and Istanbul to generate these maps. I've never used Foursquare. What am I missing other than helping to make maps like these?
