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  2. List of Facebook features - Wikipedia

    en.wikipedia.org/wiki/List_of_Facebook_features

    Listen with Friends. Listen with Friends allows Facebook users to listen to music and discuss the tunes using Facebook Chat with friends at the same time. Users can also listen in as a group while one friend acts as a DJ. Up to 50 friends can listen to the same song at the same time, and chat about it.

  3. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [5] [6] [7] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

  4. List of organizations designated by the Southern Poverty Law ...

    en.wikipedia.org/wiki/List_of_organizations...

    In 1999, the SPLC listed 457 hate groups; that number steadily increased until 2011, when 1,018 groups were listed. The rise from 2008 onward was attributed in part to anger at Barack Obama, the first black president of the United States. Thereafter, the number of hate groups steadily dropped, reaching a low of 784 in 2014 (a 23% drop).

  5. List of social platforms with at least 100 million active ...

    en.wikipedia.org/wiki/List_of_social_platforms...

    Facebook: Meta Platforms United States: 2004 3.070 billion: 2.11 billion daily active users: 2 YouTube: Alphabet Inc. United States: 2005 2.504 billion: 3 WhatsApp: Meta Platforms United States: 2009 2 billion: Had 1 billion daily active users when it had 1.3 billion monthly active users [citation needed] 4 Instagram: Meta Platforms United States

  6. QR decomposition - Wikipedia

    en.wikipedia.org/wiki/QR_decomposition

    QR decomposition. In linear algebra, a QR decomposition, also known as a QR factorization or QU factorization, is a decomposition of a matrix A into a product A = QR of an orthonormal matrix Q and an upper triangular matrix R. QR decomposition is often used to solve the linear least squares (LLS) problem and is the basis for a particular ...

  7. Social Security number - Wikipedia

    en.wikipedia.org/wiki/Social_Security_number

    In the United States, a Social Security number ( SSN) is a nine-digit number issued to U.S. citizens, permanent residents, and temporary (working) residents under section 205 (c) (2) of the Social Security Act, codified as 42 U.S.C. § 405 (c) (2). The number is issued to an individual by the Social Security Administration, an independent ...

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