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  2. 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. 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; the pattern of position detection was found and determined by applying the least-used ratio (1:1:3:1:1) in black ...

  3. Check-in QR code - Wikipedia

    en.wikipedia.org/wiki/Check-in_QR_code

    The venue code (left) and digital sentry (right) used in Shanghai, China. The check-in code or the venue code ( Chinese: 场所 码, Chǎngsuǒgmǎ) is a QR code to record check-in locations for contact tracing and epidemiologic investigations. It was widely used in Australia and China during the COVID-19 pandemic in 2020–2022.

  4. 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.

  5. Use of social network websites in investigations - Wikipedia

    en.wikipedia.org/wiki/Use_of_social_network...

    Social network services are increasingly being used in legal and criminal investigations. Information posted on sites such as Twitter, Instagram, and Facebook has been used by police and university officials to prosecute users of said sites. In some situations, content posted on Myspace has been used in court to determine an appropriate ...

  6. Facebook emotional manipulation experiment - Wikipedia

    en.wikipedia.org/wiki/Facebook_emotional...

    In 2012, Facebook, Inc. conducted one-week experiment where they tried manipulating people their emotions negatively. [1] It was revealed in 2014. [2] [3]

  7. WhatsApp - Wikipedia

    en.wikipedia.org/wiki/WhatsApp

    However, linked devices (using WhatsApp Web, WhatsApp Desktop or Facebook Portal) will become disconnected if people don't use their phone for over 14 days. The multi-device beta can only show messages for the last 3 months on the web version, which was not the case without the beta because the web version was syncing with the phone.

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