For one week, this was the most-shared video in the world. The cause-based video was March’s top search and garnered the most views ever for a YouTube video in a single day (31 million).
This video covering the song of the summer kicked off a trend of lip-sync videos from the Harvard baseball team, celebs, Olympians and the president (sort of).
This episode, featuring Obama impersonator Alphacat, is from YouTube's "Epic Rap Battles" series, which drew more than 250 million views this year. Videos of Obama and Romney have drawn over 2 billion views.
What happens when you place a mysterious sign in the middle of a Flemish square? The world wanted to know as this video brought in 25 million views in the first week it was posted, with 10 different countries viewing it over 1 million times each.
Comedian Emmanuel Hudson’s popularity exploded this year, especially in the southern U.S., with almost half of this video’s 39 million views coming from mobile devices.
Lindsey’s trademark dubstep violin styles created a lot of buzz this year- especially in the U.S., Germany and Poland. This video, which was shot by fellow YouTube creator Devin Graham, has over 500,000 likes and 100,000 comments.
A father’s reaction to his daughter’s Facebook post set off a storm of controversy, discussion, and response videos, with 11 million views in just one day.
This live stream of Felix Baumgartner’s free-fall from 128,000 feet set a live stream record with 8 million concurrent views. Since then, 14,000 posted videos have mentioned Baumgartner, and the post has attracted 30 million views.