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YouTube's top 10 most viewed video lists for 2013, led by Norwegian comedy duo Ylvis' pop hit "The Fox", both around the world and in Australia.
Over the years, YouTube's trending videos have become more slick and professional -- this year's trending videos include "The Fox," "YOLO," and "The Epic Split featuring Van Damme."
Today we'll track three disturbing teenage trends online: narcissistic "Am I Pretty?" YouTube videos, the new Rebecca Black "talent," and the worst T-shirt Abercrombie has ever sold.