The popularity of social media has grown dramatically over the World Wide Web. In this paper, we analyze the video
popularity distribution of well-known social video websites (YouTube, Google Video, and the AOL Truveo Video Search
engine) and characterize their workload. We identify trends in the categories, lengths, and formats of those videos, as well
as characterize the evolution of those videos over time. We further provide an extensive analysis and comparison of video
content amongst the main regions of the world.