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4.5.2 Collected data From the Facebook crawl, we only collected the names of the users and their list of friends. We collected additional information about the users by querying the Rice University Student Directory [136] and the Rice University Alumni Directory [135]. From these two directories, we were able to determine the users’ matriculation year, graduation year, residential college5, and major(s) or department. To correlate the Facebook user list with the directories, we first looked up each user’s name in the Student Directory, and then the Alumni Directory. If a single entry was found in either directory, the information from that entry was used. If multiple entries were found that exactly matched the student’s name, we disregarded the student. We used a conservative matching policy: only exact name matches were used.6 Overall, we found unique matches for 1,781 students in the Student Directory and 2,093 additional students in the Alumni Directory. This left us with 2,282 Facebook users who we were unable to match with a directory listing; we disregarded these users. Of the 3,874 students we were able to find records for, 1,233 (31.8%) were 5Rice University has nine residential colleges, to which incoming undergraduate students are randomly assigned. The colleges serve as dormitories, cafeterias, and social circles; students stay at the same college during their entire undergraduate tenure. 6The only exception was a list of common nicknames, such as Bob for Robert and Chris for Christopher. In these cases, a match between a name and a nickname was allowed if there was only one entry found in the Facebook crawl and in the student or alumni directory. 74PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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