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2. 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]

3. QR code - Wikipedia

   en.wikipedia.org/wiki/QR_code

   Users may receive text, add a vCard contact to their device, open a URL, or compose an e-mail or text message after scanning QR codes. They can generate and print their own QR codes for others to scan and use by visiting one of several pay or free QR code-generating sites or apps.

4. Programming languages used in most popular websites

   en.wikipedia.org/wiki/Programming_languages_used...

   One thing the most visited websites have in common is that they are dynamic websites.Their development typically involves server-side coding, client-side coding and database technology.

5. List of Facebook features - Wikipedia

   en.wikipedia.org/wiki/List_of_Facebook_features

   Additionally, Facebook expanded the use of bots, incorporating group chatbots into Messenger as "Chat Extensions", adding a "Discovery" tab for finding bots, and enabling special, branded QR codes that, when scanned, take the user to a specific bot. In August 2018, Facebook discontinued users' ability to post to their Timeline using SMS.

6. Data Matrix - Wikipedia

   en.wikipedia.org/wiki/Data_Matrix

   A Data Matrix is a two-dimensional code consisting of black and white "cells" or dots arranged in either a square or rectangular pattern, also known as a matrix. The information to be encoded can be text or numeric data. Usual data size is from a few bytes up to 1556 bytes. The length of the encoded data depends on the number of cells in the ...

7. Barcode - Wikipedia

   en.wikipedia.org/wiki/Barcode

   Barcode. A UPC-A barcode. A barcode or bar code is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines. These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called ...