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Twitter  ( / ˈ t w ɪ t ər / ) 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 of that year. 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 websi...

Facebook  is an American  for-profit corporation  and an 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 who claims to be at least 13 years old has been allowed to become a registered user of Facebook, though variations exist in the minimum age requirement, depending on ap...

Microsoft Corporation  ( / ˈ m aɪ k r ə ˌ s ɒ f t / , [2] [3]  abbreviated as  MS ) is an American  multinational   technology company  headquartered in  Redmond, Washington . It develops, manufactures, licenses, supports and sells  computer software ,  consumer electronics ,  personal computers , and services. Its best known software products are the  Microsoft Windows  line of  operating systems , the  Microsoft Office suite , and the  Internet Explorer  and  Edge   web browsers . Its flagship hardware products are the  Xbox   video game consoles  and the  Microsoft Surface  tablet lineup. As of 2016, it is the  world's largest software maker  by revenue, [4]  and one of the  world's most valuable companies . [5] Microsoft was founded by  Paul Allen  and  Bill Gates  on April 4, 1975, to develop and sell  BASIC   inter...

Yahoo!  is a web services provider, wholly owned by  Verizon Communications  through  Oath Inc. [4] [5]  and headquartered in  Sunnyvale, California . The original Yahoo! company was founded by  Jerry Yang  and  David Filo  in January 1994 and was incorporated on March 2, 1995. [6] [7]  Yahoo was one of the pioneers of the early Internet era in the 1990s. [8]   Marissa Mayer , a former  Google  executive, served as CEO and President of Yahoo until June 2017. [9] It was globally known for its  Web portal ,  search engine   Yahoo! Search , and related services, including  Yahoo! Directory ,  Yahoo! Mail ,  Yahoo! News ,  Yahoo! Finance ,  Yahoo! Groups ,  Yahoo! Answers ,  advertising ,  online mapping ,  video sharing , fantasy sports, and its social media website. At its height it was one of the most popular sites in the United States. [10]  Accordin...

Google  is an American  multinational   technology company  that specializes in  Internet -related services and products. These include  online advertising  technologies,  search ,  cloud computing ,  software , and  hardware . Google was founded in 1998 by  Larry Page  and  Sergey Brin  while they were  Ph.D.  students at  Stanford University , in California. Together, they own about 14 percent of its shares, and control 56 percent of the stockholder voting power through  supervoting stock . They incorporated Google as a privately held company on September 4, 1998. An  initial public offering  (IPO) took place on August 19, 2004, and Google moved to its new headquarters in  Mountain View, California , nicknamed the  Googleplex . In August 2015, Google announced plans to reorganize its various interests as a  conglomerate  called  Alphabet Inc.  Google...

Apple Inc.  is an American  multinational   technology company  headquartered in  Cupertino, California  that designs, develops, and sells  consumer electronics ,  computer software , and online services. The company's  hardware  products include the  iPhone  smartphone, the  iPad  tablet computer, the  Mac  personal computer, the  iPod  portable media player, the  Apple Watch  smartwatch, and the  Apple TV digital media player. Apple's consumer software includes the  macOS  and  iOS  operating systems, the  iTunes  media player, the  Safari web browser, and the  iLife  and  iWork  creativity and productivity suites. Its online services include the  iTunes Store , the  iOS App Store and  Mac App Store ,  Apple Music , and  iCloud . Apple was founded by  Steve Jobs ,  Steve Wozniak , and...