Ebay

Ebay is an online trading website.

Its trust system is said to be objective and global.

Global Trust Metric
Ebay feedback is an example of a global trust metric. After each transaction both buyer and seller can leave positive, neutral or negative feedback. These scores are totalled and presented as a measure of "trust". For example, a seller with 50'000 feedbacks which are 99.9% positive would be considered highly trusted. While a seller with 10 feedbacks which are only 40% positive would be considered untrusted.

This is a global trust metric because the feedback score for a user is global, it's the same for everyone on the system. All users will see the same feedback score for User A. While in a local trust metric each user sees a different score for every other user.