What percent of the internet is social media?

[SEOmg]

Not sure there is a percentage, but here are some facts for you from 2011:

YouTube is the second most used search engine (behind Google)
YouTube has 490 million unique visitors every month
Twitter has over 24 million visitors every month and over 500 million tweets a day
Facebook is the second most popular website in the world (behind Google)
1 in 9 People on Earth are on Facebook (avg 15 hours 33 minutes per month)
Over 250 million people access Facebook through mobile devices
30 billion pieces of content is shared through Facebook every month
Flickr hosts 5 billion images
Google + has over 25 million users and was the fastest to reach 10 million users (it took 16 days, Twitter took 780 days and Facebook took 852 days)