PeerSpective uses the shared interest between you and your friends to help guide Web search. When you run a Google search, PeerSpective includes extra results which may be relevant to your question alongside the results from Google
L. Friedman, and H. Friedman. Working Paper Series, Zicklin School of Business, Baruch College, CUNY; Graduate Center, CUNY CUNY Brooklyn College - Department of Economics, (2008)