Ten facts on YouTube's 10th birthday

Today marks ten years since YouTube opened its website to the public, with the three-man start-up now having billions of users on what is the third most visited site in the world.

The first video was uploaded to YouTube in April 2005 while the site was still private - an 18-second clip of co-founder Jawed Karim in front of the elephant enclosure at San Diego Zoo, but it was on this day in 2005 that it was opened up to other web users.

Mr Karim has since said the idea for YouTube came in the wake of Janet Jackson's infamous Super Bowl appearance and the Boxing Day tsunami in 2004 when he struggled to find video clips of both online.

The site now has more than a billion users and 300 hours of video are uploaded every minute, with localised sites in 75 countries.

To marks YouTube's milestone, here are ten facts about the site:

Being Rickroll'd is being tricked into clicking links that lead to the video for Rick Astley's Never Gonna Give You Up. That's one 'Rickroll' for every person living in London, Tokyo, NYC, Mumbai, Cairo, and Buenos Aires combined.

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