They survey was hosted on a web server located at Northeastern University, and is available at http://socialnetworks.ccs.neu.edu/yabing. They designed our survey as a Facebook application. By doing so, the application is able to query Facebook to select content to query the user about, as well as to collect the current privacy settings for the user’s uploaded content. It is important to note that all data collected is immediately hashed and anonymized; no non-anonymized data is ever written to disk