tailieunhanh - Building Web Reputation Systems- P21

Building Web Reputation Systems- P21:Today’s Web is the product of over a billion hands and minds. Around the clock and around the globe, people are pumping out contributions small and large: full-length features on Vimeo, video shorts on YouTube, comments on Blogger, discussions on Yahoo! Groups, and tagged-and-titled bookmarks. User-generated content and robust crowd participation have become the hallmarks of Web . | Content Item Abuse Hide Content Abusive Score k Staff R v ws Appui Suspected Proxy Browser Cootie Suspect Browser Cootie Age Other Negative Evaluations Best Answer hicettage User faints Level User Longevity AbuslveScore AbuseReporter AbusiveScore Contentttem Update Confirmed Reporter Karma Decision if Decision is Upheld Increase reputation of all Reporters if Decision is Overturned Decrease reputation of all Reporters x2 System ConfirmedReporter if if Content Contributor z Author AbuslveScore Contentcontributor IsAbusive FALSE AbuslveScore Contentcontributor IsAbusive - TRUES Increase Reputation of all Reporters System AbuseReporter Is Author Abusive CowwiityHide Decision if Decision is Upheld or ConrnunityHide Increase Author s AbuseKarma TERMINATE 10 ecision is Overturned Decrease Author s AbuseKarma Contentcontributor the greater of QuestloMuthorKarma vs. QuestionAnswerKarma Adjusted by AbuseKarma Updated Abuse Reporter Karma Abuse Reporter Bootstrap Adds the positive ones subtracts the negative System TrustBootstrap User Figure 10-8. Final model Eliminating the cold-start problem by giving good users an upfront advantage as abuse reporters. 266 Chapter 10 Case Study Yahoo Answers Community Content Moderation Process Is Author Abusive The inputs and calculations for this process were the same as in the third iteration of the model the process remained a repository for all confirmed and nonappealed user content violations. The only difference was that every time the system executed the process and updated AbusiveContent karma it now sent an additional message to the Abuse Reporter Bootstrap process. Process Abuse Reporter Bootstrap This process was the centerpiece of the final iteration of the model. The TrustBoot strap reputation represented the system s best guess at the reputation of users without a long history of transactions with the service. It was a weighted mixer process taking positive input from CommunityInvestment karma and weighing that against two .