• Over 800 million unique users visit YouTube each month
• Over 4 billion hours of video are watched each month on YouTube
• 72 hours of video are uploaded to YouTube every minute
• 70% of YouTube traffic comes from outside the US
• YouTube is localized in 43 countries and across 60 languages
• In 2011, YouTube had more than 1 trillion views or around 140 views for every person on Earth

Mobile and Devices

• Traffic from mobile devices tripled in 2011
• More than 20% of global YouTube views come from mobile devices
• 3 hours of video is uploaded per minute to YouTube from mobile devices
• YouTube is available on 350 million devices

Social

• 500 years of YouTube video are watched every day on Facebook, and over 700 YouTube videos are shared on Twitter each minute
• 100 million people take a social action on YouTube (likes, shares, comments, etc) every week
• More than 50% of videos on YouTube have been rated or include comments from the community
• Millions of videos are favorited every day
• Clicks on the ‘like’ or ‘dislike’ button on YouTube have doubled since the start of 2011. For every ‘dislike,’ we get 10 ‘likes’- people like to tell other people about the stuff they love.

Read More: http://www.youtube.com/t/press_statistics