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  1. 0.8–1.5% (2019, using DSM-IV-TR and ICD-10) [2] Attention deficit hyperactivity disorder ( ADHD) is a neurodevelopmental disorder characterised by executive dysfunction occasioning symptoms of inattention, hyperactivity, impulsivity and emotional dysregulation that are excessive and pervasive, impairing in multiple contexts, and otherwise age ...

  2. Pneumono­ultra­micro­scopic­silico­volcano­coniosis is the longest word in the English language. The word can be analysed as follows: This word was invented in the daily meeting from the National Puzzlers' League (N.P.L.) by its president Everett M. Smith. The word featured in the headline for an article published by the New York Herald ...

  3. Wikipedia is written by volunteer editors and hosted by the Wikimedia Foundation, a non-profit organization that also hosts a range of other volunteer projects : Commons. Free media repository. MediaWiki. Wiki software development. Meta-Wiki. Wikimedia project coordination. Wikibooks. Free textbooks and manuals.

    • History
    • Features
    • Monetization
    • Reception
    • User Growth
    • Government Attempt at Surveillance/Decryption
    • See Also

    Following tests of a new instant messaging platform on Facebook in March 2008, the feature, then-titled "Facebook Chat", was gradually released to users in April 2008. Facebook revamped its messaging platform in November 2010, and subsequently acquired group messaging service Beluga in March 2011, which the company used to launch its standalone iOS...

    The following is a table of features available in Messenger, as well as their geographical coverage and what devices they are available on. In addition there is a vanishing message feature. In addition there is an audio recording feature which allows audio recordings of up to one minute which may or may not be vanishing:

    In January 2017, Facebook announced that it was testing showing advertisements in Messenger's home feed. At the time, the testing was limited to a "small number of users in Australia and Thailand", with the ad format being swipe-based carousel ads. In July, the company announced that they were expanding the testing to a global audience. Stan Chudno...

    In November 2014, the Electronic Frontier Foundation(EFF) listed Messenger (Facebook chat) on its Secure Messaging Scorecard. It received a score of 2 out of 7 points on the scorecard. It received points for having communications encrypted in transit and for having recently completed an independent security audit. It missed points because the commu...

    After being separated from the main Facebook app, Messenger had 600 million users in April 2015. This grew to 900 million in June 2016, 1 billion in July 2016,and 1.2 billion in April 2017. In March 2020, total messaging traffic increased by 50% in countries that were on quarantine due to the COVID-19 outbreak. Group calls grew by more than 1,000%.

    In early 2018, the US Department of Justice went to court to attempt to force Facebook to modify its Messenger app to enable surveillance by third parties so that agents could listen in on encrypted voice conversations over Messenger.: 1 The court decided against the Justice Department, but sealed the case.: 1 In November 2018, the ACLU and EFF fil...

  4. en.wikipedia.org › wiki › WikipediaWikipedia - Wikipedia

    Wikipedia[note 3] is a free content online encyclopedia written and maintained by a community of volunteers, known as Wikipedians, through open collaboration and the use of the wiki-based editing system MediaWiki. Wikipedia is the largest and most-read reference work in history.[3][4] It is consistently ranked as one of the ten most popular ...

  5. en.wikipedia.org › wiki › WhatsAppWhatsApp - Wikipedia

    WhatsApp (officially WhatsApp Messenger) is an instant messaging (IM) and voice-over-IP (VoIP) service owned by technology conglomerate Meta. [14] It allows users to send text, voice messages and video messages, [15] make voice and video calls, and share images, documents, user locations, and other content.

  6. en.wikipedia.org › wiki › GmailGmail - Wikipedia

    Gmail is the email service provided by Google. As of 2019,[update] it had 1.5 billion active users worldwide, making it the largest email service in the world.[1] It also provides a webmail interface, accessible through a web browser, and is also accessible through the official mobile application. Google also supports the use of third-party ...