Maybe some of you guys know if you or FB can help, or who? Perhaps together with some University?
I got this idea that FB probably holds quite a lot of location information on people (that are using FB with location enabled) during different days of week.
Using this data it should be possible to calculate a (partially representative) statistical view of travel in cities, such as Stockholm, that could help to improve traffic planning, and possibly (which is rarely discussed) how to avoid the need for travel. The latter however, I guess, would require that people's occupation is identified in some form and mapped to corresponding company locations (incl size?) in various locations.