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The core spirit for web 2.0 is collective wisdom (i.e., the contribution of users, and the creation of value through the interaction between users). Social bookmarking sites integrate all kind of contents on the Internet (especially those generated by users), and play the role of pivot between content production and consumption. This paper mainly investigates how the positive/negative feedbacks would impact the quality of the collective wisdom within the autonomous service environments (i.e., the social bookmarking sites). Our research findings show that the performance of social bookmarking sites has a tradeoff between collective filtering (i.e., results of positive feedbacks) and front page update frequency that should be carefully managed for ensuring the good quality in collective wisdom and service performance. Moreover, the negative feedback could also shape the collective wisdom and stabilize the system performance. The research findings are believed to provide some managerial guidelines for web 2.0 sites design and operations.

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Abstract. Privacy and security has been considered as the top criterion for the acceptance of e-service adoption. In this paper, we proposed a privacy aware identity protection design that improves the flaw in cheap pseudonym design under the limitation of ambient e-service environment. This design is being applied to a collaborative iTrust platform for ambient e-service, a new scope of mobile ad-hoc e-service. The collaborative iTrust platform highlights the collaborative power from nearby user groups to eliminate potential risk and provide appropriate estimation for trust decision in the ubiquitous environment.

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