In order to reach a target sample size of 200 participants, 307 Facebook profiles owners were invited to participate in the study. Eligible profiles were identified by a random search of the freshmen, sophomore and junior undergraduate classes at our two selected universities using the Facebook search engine. All profiles returned in the search results were assessed sequentially for eligibility until the target sample size was reached. Profiles were excluded if they did not meet search criteria and were thus incorrectly listed, including those who were not undergraduates (N=448), did not meet the age criteria (N=313) or did not display their age (N=49). Profiles were also excluded for privacy settings including having any one of the following sections set to private: information section, wall or photographs (N=1630) or if a profile examination revealed that they would not be reachable for recruitment as no contact information (phone number or email) was listed on the profile or in the university directory (N=303).