The Economist made this sobering graphic of the hidden cost of the most popular YouTube video of all time—with more than two billion views since June 2012: "At 4:12 minutes, that equates to more than 140m hours, or more than 16,000 years." Then they compared it to some of humanity's most monumental tasks.
Surprise, humans spent a lot of time watching YouTube in 2013. And that time wasn't spread equally among all videos. Nay, some videos got more than their fair share of eyeballs. Here are the most popular YouTube videos (and music videos) of 2013, for your viewing pleasure.