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YouTube is a video-sharing website headquartered in San Bruno, California. The service was created by three former PayPalemployees in February 2005 and has been owned by Google since late 2006.[4] The site allows users to upload, view, and share videos,Available content includes video clips, TV clips, music videos, and other content such as video blogging, short original videos, and educational videos.

Most of the content on YouTube has been uploaded by individuals, but media corporations including CBS, the BBC, Vevo, Hulu, and other organizations offer some of their material via YouTube, as part of the YouTube partnership program.Unregistered users can watch videos, and registered users can upload videos to their channels.YouTube, LLC was bought by Google for US$1.65 billion in November 2006 and now operates as a Google subsidiary.YouTube was founded by Chad Hurley, Steve Chen and Jawed Karim, who were all early employees of PayPal.

According to a story that has often been repeated in the media, Hurley and Chen developed the idea for YouTube during the early months of 2005.

Uploading

All YouTube users can upload videos up to 15 minutes each in duration.Users who have a good track record of complying with the site's Community Guidelines may be offered the ability to upload videos up to 12 hours in length, which requires verifying the account. When YouTube was launched in 2005, it was possible to upload long videos, but a ten-minute limit was introduced in March 2006. YouTube accepts videos uploaded in most container formats, including .AVI, .MKV, .MOV, .MP4, DivX, .FLV, and .ogg and .ogv .These include video formats such as MPEG-4,MPEG, VOB, and .WMV. It also supports 3GP, allowing videos to be uploaded from mobile phones.All the video formats on YouTube use progressive scanning.

Quality

YouTube originally offered videos at only one quality level, displayed at a resolution of 320x240 pixels using the Sorenson Spark codec with mono MP3 audio.In June 2007, YouTube added an option to watch videos in 3GP format on mobile phones. In March 2008, a high quality mode was added, which increased the resolution to 480x360 pixels.

In November 2008, 720p HD support was added. In June 2014, YouTube introduced videos playing at 60 frames per second, in order to reproduce video games with a frame rate comparable to high-end graphics cards.The videos play back at a resolution of 720p or higher.

Platforms

Since June 2007, YouTube's videos have been available for viewing on a range of Apple products.YouTube videos can be viewed on devices including Apple TV, iPod Touch and the iPhone.In July 2010, the mobile version of the site was relaunched based on HTML5, avoiding the need to use Adobe Flash Player and optimized for use with touch screen controls.In September 2012, YouTube launched its first app for the iPhone, following the decision to drop YouTube as one of the preloaded apps in the iPhone 5 and iOS 6 operating system.

Localization

On June 19, 2007, Google CEO Eric Schmidt was in Paris to launch the new localization system.The interface of the website is available with localized versions in 74 countries, one territory and a worldwide version.

Community Policy

YouTube has a set of community guidelines aimed to reduce abuse of the site's features. Generally prohibited material includes sexually explicit content, videos of animal abuse,shock videos, content uploaded without the copyright holder's consent, hate speech, spam, and predatory behaviour.Despite the guidelines,YouTube has faced criticism from news sources for content in violation of these guidelines.

View Counts

In December 2012, two billion views were removed from the view counts of Universal and Sony music videos on YouTube, prompting a claim by The Daily Dot that the views had been deleted due to a violation of the site's terms of service, which ban the use of automated processes to inflate view counts. This was disputed by Billboard, which said that the two billion views had been moved to Vevo, since the videos were no longer active on YouTube.