YouTube is marking its fifth anniversary by announcing the service has exceeded two billion daily views, demonstrating rapid growth in popularity since reaching the one billion-mark late in 2009.
The site, created by Chad Hurley and Steve Chen, notched up eight million daily views within six months and was acquired within 18 months by Google for $1.65bn in 2006.
YouTube insiders attribute the recent growth to site improvements that made it easier for users to discover videos they might like, expanding categories such as news and instructional videos, and increasing traffic from mobile devices, according to the San Francisco Chronicle.
To mark its fifth anniversary, YouTube will showcase an interactive timeline with links to some of its most popular and influential videos.
YouTube's rapid rise has been tempered by a backlash from media companies over copyright infringements.
YouTube has worked to win over major media companies by developing technology to detect copyrighted media and sharing advertising revenue with affected content owners.
But some are still reluctant to provide content to YouTube, while others have signed agreements with YouTube rival Hulu.com.
Since acquiring YouTube, Google has worked to increase the site's revenue streams through various types of advertising on the site.
Analysts predict that YouTube could generate $945m in 2010 and Google executives have said the site is nearing profitability as competition grows.