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2. 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.

3. 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.

4. 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 ...

5. Add or disable 2-step verification for extra security - AOL Help

   help.aol.com/articles/2-step-verification...

   1-800-358-4860. Get live expert help with your AOL needs—from email and passwords, technical questions, mobile email and more. Add or disable 2-step verification for extra security. Add an extra security step to sign into your account with 2-step verification. Find out how to turn on 2-step verification and receive a verification code, and ...

6. Fix problems signing into your AOL account

   help.aol.com/articles/help-signing-in

   If you're caught in a loop where the sign-in screen keeps reappearing after you click "Sign in," you'll need to reset the "sign-in" cookie. After entering your username on the sign-in page, click. If that doesn't fix the problem, try these steps and attempt to sign in after each one: Try signing into a different sign-in page, like our.

7. 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 ...