Tony Blair launched Downing Street's official YouTube channel in 2007.
YouTube now gets over a billion hits a day, according to a new video blog post by the founder of the website.
Chad Hurley's blog marks the third anniversary of YouTube's controversial acquisition by Google.
The site was bought by Google in 2006 for $1.65bn - a price it later described as "a premium".
Earlier this year YouTube was at the centre of a content row over the amount of royalties it paid to musicians for hosting music videos.
Six months later the dispute was resolved when Google agreed to pay UK royalty collecting body PRS for Music an undisclosed lump sum.
Music videos reappeared for British YouTube visitors in September.
Mr Hurley co-founded the website in 2004 with Steve Chen and Jawed Karim.
They met while employees at online pay service PayPal.
"We wanted to create a place where anyone with a video camera, a computer, and an internet connection can share their life, art, and voice with the world, and in many cases they can make a living from doing so," Mr Hurley said, reflecting on YouTube's original aims.