tailieunhanh - Building Web Reputation Systems- P16

Building Web Reputation Systems- P16: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 . | Most Popular Most Viewed HD more Play All Today This Week This Month All Time President Barack Obama 2009 Inau. 1 day ago 957 views CSPAN Bush gets booed as he hears Hall. 1 day ago 446 782 views VoiceofAmericans2008 Jarret Johnson Puts His Foot Int. 1 day ago 462 927 views BasketsOlden t u ng 2009 Euros CD Rubleva Shefer 1 day ago Barack Obama Inauguration 1 day ago 293 523 views WIII24411 Vamos trocar idélas 1 day ago 426 407 views vamostrocarideias Barack Obama Inauguration 1 day ago 257 346 views will24411 292 951 views WhiîeCrowAgain Barack and Michelle Obama s 1 day ago 231 004 views twolflO Figure 7-16. Content example YouTube s most viewed videos. Figure 7-17. Karma example Yahoo Answers leaderboard. Reputation Display Patterns 191 Top-X ranking This is a specialized type of leaderboard where top-ranking entities are grouped into numerical categories of performance. Achieving top-10 status or even top-100 should be a rare and celebrated feat. When using Top-X ranking Use top-X leaderboards for content to highlight only the best of the best contributions in your community. Figure 7-18 shows a Top-X display for content Billboard s Hot 100 s list of top recordings. The artists themselves have very little if any direct influence over their song s rank on this list. Use top-X designations for people sparingly and only in contexts that are competitive by nature. Because available categories in a top-X system are bounded they will have greater perceived value in the community. Figure 7-19 displays the new index of Top-X karma for review writers. The very high number of reviews written by each of these leaders creates value both for Amazon and the reviewers themselves. Authors and publishers seek them out to review endorse their book sometimes for a nominal fee. The original version of this reputation system now known as Classic Reviewer Rank suffered deeply from first-mover effects see First-mover effects on page 63 and other problems detailed in