Buzzdata is a site that allows users to set up accounts and share or follow datasets. Data sets are placed in Datarooms, or spaces where followers and viewers can engage and discuss the datasets in a variety of different ways. The data that is shared in public rooms are ones that are under open licenses, making the site a rich source of open data. With tools to help visualize and present data, as well as many new features on the way, this site is one to keep track of.
My Profile: http://buzzdata.com/futuresurban