The anatomy of a large-scale hypertextual Web search engine
WWW7 Proceedings of the seventh international conference on World Wide Web 7
Accurately interpreting clickthrough data as implicit feedback
Proceedings of the 28th annual international ACM SIGIR conference on Research and development in information retrieval
Communications of the ACM - Special issue: RFID
The security cost of cheap user interaction
Proceedings of the 2011 workshop on New security paradigms workshop
Community-based web security: complementary roles of the serious and casual contributors
Proceedings of the ACM 2012 conference on Computer Supported Cooperative Work
Re-evaluating the wisdom of crowds in assessing web security
FC'11 Proceedings of the 15th international conference on Financial Cryptography and Data Security
An online experiment of privacy authorization dialogues for social applications
Proceedings of the 2013 conference on Computer supported cooperative work
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Widely-used online ''trust'' authorities issue certifications without substantial verification of recipients' actual trustworthiness. This lax approach gives rise to adverse selection: the sites that seek and obtain trust certifications are actually less trustworthy than others. Using an original dataset on web site safety, I demonstrate that sites certified by the best-known authority, TRUSTe, are more than twice as likely to be untrustworthy as uncertified sites. This difference remains statistically and economically significant when restricted to ''complex'' commercial sites. Meanwhile, search engines create an implied endorsement in their selection of ads for display, but I show that search engine advertisements tend to be less safe than the corresponding organic listings.