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Programming languages used in most popular websites

The most popular (i.e., the most visited) websites have in common that they are dynamic websites. Their development typically involves server side coding, client side coding and database technology. The programming languages applied to deliver similar dynamic web content however vary vastly between sites.

Programming languages used in most popular websites*

Websites Front-end (Client-side) Back-end (Server-side) Database
Google.com JavaScript C, C++, Go, Java, Python BigTabele, MariaDb
YouTube.com Flash, JavaScript C/C++, Python, Java, Go MySQL, BigTable
Facebook.com JavaScript Hack, PHP, C++, Java, Python, Erlang, D, Xhp MySQL, HBase
Yahoo.com JavaScript JavaScript, PHP MySQL, PostgreSQL
Amazon.com JavaScript Java, C++, Perl  
Wikipedia.org JavaScript PHP MySQL, MariaDB
Twitter.com JavaScript C++, Java, Scala, Ruby on Rails MySQL
Bing.com JavaScript ASP.NET Microsoft SQL Server
eBay.com JavaScript Java, JavaScript Oracle Database
MSN.com JavaScript ASP.NET Microsoft SQL Serve
Microsoft.com      
Linkedin.com JavaScript Java, JavaScript, Scala Voldemort
Pinterest.com     MySQL, Redis
Ask.com      
Wordpress.com JavaScript PHP MySQL

Source: Wikipedia

*data on programming languages are based on: