"Trust is a way for social beings to cope with the uncertainty they face i everyday life. We rely on people we trust to give s information about ne people. We are able to compose their input and come up with a judgemen In social networks that emerge on the web, the chance of encountering a individual we do not know is much higher than in o r "real" lives. Whe explicit trust ratings are specified on social networks, can thes be automatically composed so that a new val e can be inferred? Thi project looks at metrics for inferring trust over web based socia networks, and applications of these rating" Trust and Reputation in Web-based Social Networks