The following are a list of sources I have started to compile as I search for data that I can use in my studies. I hope people will add to this list so we can make a master list for everyone to use.

http://www.trustlet.org/wiki/Trust_network_datasets
http://datamob.org/datasets/tag/social-networks
http://www-personal.umich.edu/~mejn/netdata/
http://www.datawrangling.com/some-datasets-available-on-the-web
http://snap.stanford.edu/data/
http://toreopsahl.com/datasets/
http://casci.umd.edu/Social_Network_Analysis_Datasets