A bunch of great people (and me) are organizing a workshop at the upcoming ICWSM conference. If you are interested in cities and social media, make sure you submit your work! :)
Here is the CFP:
The 2nd When the City Meets the Citizens Workshop:
Big Data and the Study of the Urban Habitat
Boston, July 11th 2013 (WCMCW)
In conjunction with the International AAAI Conference on Weblogs and Social Media (ICWSM)
http://researcher.watson.ibm.com/researcher/view_project.php?id=4394