Netvizz

Netvizz is a data collection and extraction application that allows researchers to export data in standard file formats from different sections of the Facebook social networking service. Friendship networks, groups, and pages can thus be analyzed quantitatively and qualitatively with regards to demographical, postdemographical, and relational characteristics.

(Copied from http://thepoliticsofsystems.net/permafiles/rieder_websci.pdf)