Jinpeng Huai Robin Chen Hsiao-Wuen Hon Yunhao Liu Wei-Ying Ma Andrew Tomkins Xiaodong Zhang Proceedings of the 17th International Conference on World Wide Web, WWW 2008, Beijing, China, April 21-25, 2008 WWW ACM 2008 db/conf/www/www2008.html 978-1-60558-085-2