PLENTY OF VIRAL VIDEOS will emerge in 2012 but Walk Off The Earth's work is the first one I've spotted in 2012. At its current rate of viewing, I reckon the first of March will show that more people will have watched the cover of "Somebody That I Used To Know" than the original.
I spotted ten hands and one guitar on Google Plus during the first week of January when they had fewer than 3000 views on YouTube. As I blog about it on the last Saturday of January 2012, more than 40m people have watched the clip. The original by Melbourne-based Gotye has been seen by 51m people.
Grammar Hammers will tell you the correct usage is "Someone who I used to know" and that Gotye has two acceptable pronunciations, but one of them is not Got-SHEA.
Bonus Link: Gotye Radio