1. A computer system for measuring confidence in a user in a video hosting system, comprising: a scoring server, executed by the video hosting system, and configured to generate a trust score based on user information, the trust score representing a measure of trust in the user, and the user information including information describing the activities of other users with respect to the user's uploaded videos; and an evaluation server coupled to the scoring server and configured to rank a user account associated with the user into one of a plurality of ranking tiers based on the trust score and to selectively evaluate videos provided by the user based on the trust score, the users of different trust ranks being able to upload videos of different lengths, and wherein users of higher trust ranks being able to upload longer videos than users of lower trust ranks.