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2. WhatsApp - Wikipedia

   en.wikipedia.org/wiki/WhatsApp

   WhatsApp Web's user interface is based on the default Android one and can be accessed through web.whatsapp.com. Access is granted after the users scan their personal QR code through their mobile WhatsApp application. There are similar solutions for macOS, such as the open-source ChitChat, previously known as WhatsMac. [193] [194] [195]

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. WeChat - Wikipedia

   en.wikipedia.org/wiki/WeChat

   The company also provides WeChat for Web, a web-based client with messaging and file transfer capabilities. Other functions cannot be used on it, such as the detection of nearby people, or interacting with Moments or Official Accounts. To use the Web-based client, it is necessary to first scan a QR code using the phone app. This means it is not ...

5. Barcode - Wikipedia

   en.wikipedia.org/wiki/Barcode

   Defunct as of 2019, replaced by standard QR codes. Micro QR code: Micro QR code is a smaller version of the QR code standard for applications where symbol size is limited. Micro PDF417: MicroPDF417 is a restricted size barcode, similar to PDF417, which is used to add additional data to linear barcodes. MMCC

6. Symptom Checker with Body from WebMD - Check Your Medical ...

   symptoms.webmd.com

   Identify possible conditions and treatment related to your symptoms. This tool does not provide medical advice. NEW: This symptom checker now includes the ability to select symptoms by body location. We hope this makes it easier for you to identify your symptoms and possible conditions. The tool also allows you to select multiple symptoms quickly.

7. Timeline of WhatsApp - Wikipedia

   en.wikipedia.org/wiki/Timeline_of_WhatsApp

   WhatsApp's user base swells to about 200 million active users and its staff to 50. [2] 2013: July: Funding: Sequoia invests another $50 million in Series B round, valuing WhatsApp at $1.5 billion. [9] 2013: July 16: Product: WhatsApp goes free, with an annual subscription fee of $1 after the first year. [10] [11] 2013: August: Competition