How do YouTube videos go viral?

How do YouTube videos go viral? YouTube personality Kevin Nalty (known as Nalts) recalls on his blog: “A few years ago, a video could be considered ‘viral’ if it hit a million views”, but says as of 2011, only “if it gets more than 5 million views in a 3–7-day period” can it be considered “viral”.

YouTube personality Kevin Nalty (known as Nalts) recalls on his blog: “A few years ago, a video could be considered ‘viral’ if it hit a million views”, but says as of 2011, only “if it gets more than 5 million views in a 3–7-day period” can it be considered “viral”.