"Web-Based Alcohol Screening and Brief Intervention for University Students"
JAMA 
http://jama.jamanetwork.com/article.aspx?articleid=1849990
"Conclusions and Relevance  A national web-based alcohol screening and brief intervention program produced no significant reductions in the frequency or overall volume of drinking or academic problems. There remains a possibility of a small reduction in the amount of alcohol consumed per typical drinking occasion."