Most videos enable users to leave comments, and these have attracted attention for the negative aspects of both their form and content. In 2006, Time praised Web 2.0 for enabling "community and collaboration on a scale never seen before", and added that YouTube "harnesses the stupidity of crowds as well as its wisdom. Some of the comments on YouTube make you weep for the future of humanity just for the spelling alone, never mind the obscenity and the naked hatred". The Guardian in 2009 described users' comments on YouTube as:
How does a video streaming service with one billion active users per month and $4 billion in revenue not turn a profit? Ask YouTube, which couldn't break free from breaking even in 2014, according to a new report. Sources tell the Wall Street Journal that Google's video unit posted $4 billion in revenue last year, up from $3 billion in 2013, and that while the service accounted for 6 percent of Google's overall sales, it contributed nothing to earnings.
The Pentagon’s admission, relayed to the Senate, came a week after The Atlantic revealed “errors in accounting” in how the U.S. had tracked and billed the Saudi-led coalition for refueling costs—a service that was among the most visible and controversial elements of support as civilian casualties grew. Washington’s support began in March 2015 under President Barack Obama, without explicit congressional authorization, and continued under the Trump administration, amid growing outrage in Congress over Saudi conduct. That changed last month when the Pentagon said it had ended aerial refueling at Riyadh’s request. The Pentagon’s acknowledgement puts a number to at least part of the expansive assistance that the U.S. provided to the Saudi-led coalition in Yemen over the last few years.
YouTube announced the project in September 2016 at an event in India. It was launched in India in February 2017, and expanded in November 2017 to 14 other countries, including Nigeria, Indonesia, Thailand, Malaysia, Vietnam, the Philippines, Kenya, and South Africa. It was rolled out in 130 countries worldwide, including Brazil, Mexico, Turkey, and Iraq on February 1, 2018. The app is available to around 60% of the world's population.
YouTube originally offered videos at only one quality level, displayed at a resolution of 320×240 pixels using the Sorenson Spark codec (a variant of H.263), 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 480×360 pixels. In November 2008, 720p HD support was added. At the time of the 720p launch, the YouTube player was changed from a 4:3 aspect ratio to a widescreen 16:9. With this new feature, YouTube began a switchover to H.264/MPEG-4 AVC as its default video compression format. In November 2009, 1080p HD support was added. In July 2010, YouTube announced that it had launched a range of videos in 4K format, which allows a resolution of up to 4096×3072 pixels. In June 2015, support for 8K resolution was added, with the videos playing at 7680×4320 pixels. In November 2016, support for HDR video was added which can be encoded with Hybrid Log-Gamma (HLG) or Perceptual Quantizer (PQ). HDR video can be encoded with the Rec. 2020 color space.
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YouTube allows users to upload, view, rate, share, add to favorites, report, comment on videos, and subscribe to other users. It offers a wide variety of user-generated and corporate media videos. Available content includes video clips, TV show clips, music videos, short and documentary films, audio recordings, movie trailers, live streams, and other content such as video blogging, short original videos, and educational videos. Most of the content on YouTube is uploaded by individuals, but media corporations including CBS, the BBC, Vevo, and Hulu 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 upload 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.