?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Morrison%2C+Greg&rft.aufirst=Greg&rft.aulast=Morrison&rft.volume=7&rft.title=PloS+One&rft.atitle=Discovering+Communities+through+Friendship&rft.date=2012&rft.pages=e38704&rft.issue=7&rft.issn=1932-6203&rft.genre=article