YouTube

From Wikipedia, the free encyclopedia

YouTube, LLC

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Type of business	Subsidiary
Type of site	Video hosting service
Founded	February 14, 2005; 12 years ago
Headquarters	901 Cherry Avenue, San Bruno, California, United States
Coordinates	37.628101°N 122.426424°WCoordinates: 37.628101°N 122.426424°W
Area served	Worldwide (except blocked countries)
Owner	Alphabet Inc.
Founder(s)	Steve Chen Chad Hurley Jawed Karim
Key people	Susan Wojcicki (CEO) Chad Hurley (Adviser)
Industry	Internet Video hosting service
Parent	Google (2006–present)
Slogan(s)	Broadcast Yourself (2005–2012)
Website	YouTube.com (see list of localized domain names)
Alexa rank	2 (Global, February 2017)[1]
Advertising	Google AdSense
Registration	Optional (not required to watch most videos; required for certain tasks such as uploading videos, viewing flagged (18+) videos, creating playlists, liking or disliking videos and posting comments)
Launched	February 14, 2005; 12 years ago
Current status	Active
Content license	Uploader holds copyright (standard license); Creative Commons can be selected.
Written in	Java,[2] Python[3] and proprietary JavaScript

YouTube is an American video-sharing website headquartered in San Bruno, California. The service was created by three former PayPal employees—Chad Hurley, Steve Chen, and Jawed Karim—in February 2005. Google bought the site in November 2006 for US$1.65 billion; YouTube now operates as one of Google's subsidiaries. The site allows users to upload, view, rate, share, add to favorites, report and comment on videos, subscribe to other users, and it makes use of WebM, H.264/MPEG-4 AVC, and AdobeFlash Video technology to display 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 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, 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 offensive are available only to registered users affirming themselves to be at least 18 years old.

YouTube earns advertising revenue from Google AdSense, 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 YouTube Red, 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, the website was ranked as the second most popular site by Alexa Internet, a web traffic analysis company,^[1] there are more than 400 hours of content uploaded to the service each minute, and one billion hours of content is watched on YouTube every day.

Twitter

From Wikipedia, the free encyclopedia

For other uses, see Twitter (disambiguation).

"Tweeted" redirects here. For other uses, see Tweet (disambiguation).

Twitter, Inc.

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Type of business	Public
Type of site	News and social network service
Available in	Multilingual
Traded as	NYSE: TWTR
Founded	March 21, 2006; 11 years ago[1]
Headquarters	San Francisco, California, U.S.[2]
Coordinates	37.7768°N 122.4166°WCoordinates: 37.7768°N 122.4166°W
Area served	Worldwide
Founder(s)	Jack Dorsey Noah Glass Biz Stone Evan Williams
Key people	Omid Kordestani (Executive Chairman) Jack Dorsey (CEO)
Industry	Internet
Revenue	US$2.52 billion (2016)[3]
Net income	US$-456 million (2016)[3]
Employees	3,898 (2016)[4]
Subsidiaries	Vine Periscope
Website	twitter.com
Alexa rank	16 (Global, February 2017)[5]
Registration	Required to post, follow, or be followed
Users	319 million active users (2016)[6]
Launched	July 15, 2006[7]
Current status	Active
Written in	Java,[8][9] Ruby,[8] Scala,[8]JavaScript[8]

Twitter (/ˈtwɪtər/) is an online news and social networking service where users post and interact with messages, "tweets," restricted to 140 characters. Registered users can post tweets, but those who are unregistered can only read them. Users access Twitter through its website interface, SMS or a mobile device app.^[10] Twitter Inc. is based in San Francisco, California, United States, and has more than 25 offices around the world.^[11]

Twitter was created in March 2006 by Jack Dorsey, Noah Glass, Biz Stone, and Evan Williams and launched in July, whereby the service rapidly gained worldwide popularity. In 2012, more than 100 million users posted 340 million tweets a day,^[12] and the service handled an average of 1.6 billion search queries per day.^[13][14][15] In 2013, it was one of the ten most-visited websites and has been described as "the SMS of the Internet".^[16][17] As of 2016, Twitter had more than 319 million monthly active users.^[6] On the day of the 2016 U.S. presidential election, Twitter proved to be the largest source of breaking news, with 40 million tweets sent by 10 p.m. (Eastern Time) that day.^[18]

Facebook

From Wikipedia, the free encyclopedia

This article is about the social networking service. For the type of directory, see face book.

Facebook, Inc.

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Type of business	Public
Type of site	Social networking service
Available in	Multilingual (140)
Traded as	NASDAQ: FB NASDAQ-100 Component S&P 100 Component S&P 500 Component
Founded	February 4, 2004; 13 years ago
Headquarters	Menlo Park, California, United States
Coordinates	37.4848°N 122.1484°WCoordinates: 37.4848°N 122.1484°W
Area served	United States (2004–05) Worldwide, except blocking countries (2005–present)
Founder(s)	Mark Zuckerberg Eduardo Saverin Andrew McCollum Dustin Moskovitz Chris Hughes
Key people	Mark Zuckerberg (Chairman and CEO) Sheryl Sandberg (COO)
Industry	Internet
Revenue	US$27.638 billion (2016)[1]
Operating income	US$12.427 billion (2016)[1]
Net income	US$10.217 billion (2016)[1]
Total assets	US$64.961 billion (2016)[1]
Total equity	US$59.194 billion (2016)[1]
Employees	17,048 (December 31, 2016)[2]
Subsidiaries	Instagram Messenger WhatsApp Oculus VR
Website	www.facebook.com or www.fb.com
Alexa rank	3 (February 2017)[3]
Registration	Required
Users	1.86 billion monthly active users (December 31, 2016)[2]
Current status	Active
Written in	C++, PHP (as HHVM)[4] and D language[5]

Facebook is an American for-profit corporation and online social media and social networking service based in Menlo Park, California. The Facebook website was launched on February 4, 2004, by Mark Zuckerberg, along with fellow Harvard College students and roommates, Eduardo Saverin, Andrew McCollum, Dustin Moskovitz, and Chris Hughes.^[6][7]

The founders had initially limited the website's membership to Harvard students; however, later they expanded it to higher education institutions in the Boston area, the Ivy League schools, and Stanford University. Facebook gradually added support for students at various other universities, and eventually to high school students as well. Since 2006, anyone age 13 and older has been allowed to become a registered user of Facebook, though variations exist in the minimum age requirement, depending on applicable local laws.^[8] The Facebook name comes from the face book directories often given to United States university students.^[9]

Facebook may be accessed by a large range of desktops, laptops, tablet computers, and smartphones over the Internet and mobile networks. After registering to use the site, users can create a user profile indicating their name, occupation, schools attended and so on. Users can add other users as "friends", exchange messages, post status updates and digital photos, share digital videos and links, use various software applications ("apps"), and receive notifications when others update their profiles or make posts. Additionally, users may join common-interest user groups organized by workplace, school, hobbies or other topics, and categorize their friends into lists such as "People From Work" or "Close Friends". In groups, editors can pin posts to top. Additionally, users can complain about or block unpleasant people. Because of the large volume of data that users submit to the service, Facebook has come under scrutiny for its privacy policies. Facebook makes most of its revenue from advertisements which appear onscreen.

Facebook, Inc. held its initial public offering (IPO) in February 2012, and began selling stock to the public three months later, reaching an original peak market capitalization of $104 billion. On July 13, 2015, Facebook became the fastest company in the Standard & Poor's 500 Index to reach a market cap of $250 billion.^[10] Facebook has more than 1.86 billion monthly active users as of December 31, 2016.^[11] As of April 2016, Facebook was the most popular social networking site in the world, based on the number of active user accounts.^[12] Facebook classifies users from the ages of 13 to 18 as minors and therefore sets their profiles to share content with friends only.^[13]