Key points are not available for this paper at this time.
http://cacm.acm.org/blogs/blog-cacm The Communications Web site, http://cacm.acm.org, features more than a dozen bloggers in the BLOG@CACM community. In each issue of Communications , we'll publish selected posts or excerpts. twitter Follow us on Twitter at http://twitter.com/blogCACM Greg Linden asks if spammers have been defeated; Michael Bernstein discusses Clay Shirky's keynote speech at CSCW 2010; and Erika S. Poole writes about how the digital world can help parents cope with the death of a child.
Linden et al. (Tue,) studied this question.