HARVARD COLLEGE - May 31 - Associate Professor Mikolaj Piskorski investigates whether dating sites are helping the lonely or just making life easier for young singles who are popular already. He is documenting his findings in a book, due to come out in 2013. OkCupid provided Piskorski with information about its members, covering user demographics and usage patterns - how users learned about one another's profiles, how many profiles they viewed on average, and how many introductory messages they sent after viewing those profiles. The big finding is that men who view most profiles are least likely to message. Older, shorter, and relatively overweight men tended to view more profiles. People who expect rejection may simply refrain from writing, unless the site gives them an encouragement to do so.