10. The hot video prediction method of claim 7 , wherein the step of updating the social network comprises: determining whether the prediction result is correct according to browsed times of the new video; updating user interest features according to the result obtained by the prediction verifying unit; updating the user social network by pruning irrelevant common interests from the user social network according to the updated user interest features.
7. A hot video prediction method, comprising: storing, by a video comments database, a plurality of video comments submitted by a plurality of users during a period of time in the past; establishing, by a user social network constructor, a user social network of the users according to the video comments; upon receiving a new comment of a new video, determining, by a hot video predictor, a similar theme between the new video comment content and comment content of hot videos that have been popular for the period of time according to the user social network, and predicting whether the new video is going to be popular accordingly; and verifying, the prediction by a social network adaptor, and modifying the user social network by the social network adaptor accordingly.