tailieunhanh - Building Web Reputation Systems- P12

Building Web Reputation Systems- P12: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 . | How long will this item be relevant news article message board post tv episode restaurant Ephemeral LIFESPAN OF CONTENT Permanent Figure 6-3. The value of ratings increases with the time value of the content being rated. Items with a great deal of persistence such as real-world establishments like restaurants or businesses make excellent candidates for reputation. Furthermore it can be appropriate to ask users for more involved types of inputs for persistent items because it s likely that other users will have a chance to benefit from the work that the community puts into contributing content. Determining Inputs Now that you have a firm grasp of the objects in your system and you ve elected a handful as reputable entities the next step is to decide what s good and what s bad. How will you decide What inputs will you feed into the system to be tabulated and rolled up to establish relative reputations among like objects User Actions Make Good Inputs Now instead of merely listing the objects that a user might interact with in your application we ll enumerate all the actions that she might take in relation to those objects. Again many actions will be obvious and visible right there in your application interface as in Figure 6-4 so let s build on the audit that you performed earlier for objects. Explicit claims Explicit claims represent your community s voice and opinion. They operate through interface elements you provide that solicit users opinions about an entity good or bad. A fundamental difference exists between explicit claims and implicit ones discussed below which boils down to user intent and comprehension. With explicit claims users should be fully aware that the action they re performing is intended as an expression of an opinion. That intent differs greatly from the ones for implicit claims in which users mostly just go about their business generating valuable reputation information as a side effect. Determining Inputs 131 Figure 6-4. Look at all of the .