It offers a wide variety of and videos. Available content includes , clips, , and films, audio recordings, , , and other content such as , short original videos, and. Most of the content on YouTube is uploaded by individuals, but media corporations including , the , , and offer some of their material via YouTube as part of the YouTube partnership program. Unregistered users can only watch videos on the site, while registered users are permitted to an unlimited number of videos and add comments to videos. Videos deemed potentially inappropriate are available only to registered users affirming themselves to be at least 18 years old. YouTube earns advertising revenue from Google , a program which targets ads according to site content and audience. The vast majority of its videos are free to view, but there are exceptions, including subscription-based premium channels, film rentals, as well as , a subscription service offering ad-free access to the website and access to exclusive content made in partnership with existing users. As of February 2017 , there were more than 400 hours of content uploaded to YouTube each minute, and one billion hours of content being watched on YouTube every day. As of August 2018 , the website is ranked as the second-most popular site in the world, according to. From left to right: , and , the founders of YouTube YouTube was founded by , , and , who were all early employees of. Hurley had studied design at , and Chen and Karim studied together at the. 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, after they had experienced difficulty sharing videos that had been shot at a dinner party at Chen's apartment in San Francisco. Karim said the inspiration for YouTube first came from 's role in the 2004 , when her breast was exposed during her performance, and later from the. Karim could not easily find video clips of either event online, which led to the idea of a video sharing site. Hurley and Chen said that the original idea for YouTube was a video version of an , and had been influenced by the website. YouTube's early headquarters were situated above a pizzeria and Japanese restaurant in. The first YouTube video, titled , shows co-founder Jawed Karim at the. The video was uploaded on April 23, 2005, and can still be viewed on the site. YouTube offered the public a beta test of the site in May 2005. The first video to reach one million views was a advertisement featuring in November 2005. The site grew rapidly and, in July 2006, the company announced that more than 65,000 new videos were being uploaded every day, and that the site was receiving 100 million video views per day. According to data published by market research company , YouTube is the dominant provider of online video in the United States, with a of around 43% and more than 14 billion views of videos in May 2010. In May 2011, 48 hours of new videos were uploaded to the site every minute, which increased to 60 hours every minute in January 2012, 100 hours every minute in May 2013, 300 hours every minute in November 2014, and 400 hours every minute in February 2017. As of January 2012, the site had 800 million unique users a month. It is estimated that in 2007 YouTube consumed as much as the entire Internet in 2000. According to third-party web analytics providers, and , YouTube is the second-most visited website in the world, as of December 2016 ; SimilarWeb also lists YouTube as the top TV and video website globally, attracting more than 15 billion visitors per month. In October 2006, YouTube moved to a new office in. The choice of the name www. The site's owner, , filed a lawsuit against YouTube in November 2006 after being regularly overloaded by people looking for YouTube. Universal Tube has since changed the name of its website to www. In October 2006, Inc. YouTube's headquarters in San Bruno, California In March 2010, YouTube began free streaming of certain content, including 60 cricket matches of the. According to YouTube, this was the first worldwide free online broadcast of a major sporting event. On March 31, 2010, the YouTube website launched a new design, with the aim of simplifying the interface and increasing the time users spend on the site. This increased to three billion in May 2011, and four billion in January 2012. In February 2017, one billion hours of YouTube was watched every day. In October 2010, Hurley announced that he would be stepping down as chief executive officer of YouTube to take an advisory role, and that would take over as head of the company. In April 2011, James Zern, a YouTube software engineer, revealed that 30% of videos accounted for 99% of views on the site. In November 2011, the social networking site was integrated directly with YouTube and the web browser, allowing YouTube videos to be viewed from within the Google+ interface. YouTube logo from 2015 until 2017 In December 2011, YouTube launched a new version of the site interface, with the video channels displayed in a central column on the home page, similar to the news feeds of social networking sites. At the same time, a new version of the YouTube logo was introduced with a darker shade of red, the first change in design since October 2006. In May 2013, YouTube launched a pilot program for content providers to offer premium, subscription-based channels within the platform. In February 2014, was appointed of YouTube. In February 2015, YouTube released a secondary mobile app known as. The app is designed to provide an experience optimized for children. It features a simplified user interface, curated selections of channels featuring age-appropriate content, and parental control features. Later on August 26, 2015, YouTube launched YouTube Gaming—a -oriented vertical and app for videos and live streaming, intended to compete with the -owned. In October 2015, YouTube announced YouTube Red now , a new premium service that would offer ad-free access to all content on the platform succeeding the Music Key service released the previous year , premium original series and films produced by YouTube personalities, as well as background playback of content on mobile devices. YouTube also released , a third app oriented towards streaming and discovering the music content hosted on the YouTube platform. The complex has 554,000 square feet of space and
