Facebook is making use of ReactJS. Their webpage is built with React, as the script that is blended in the application code. The mobile app is also build with a version of React called React Native which is similar, although responsible for displaying the iOS and Android native components instead of the DOM elements. 

The use of ReactJS within Instagram is huge. A proof for that are the numerous features including the geo locations, Google Maps APIs, search engine accuracy as well as tags that pop out without hashtags. It is all there in the API of the app – and is really impressive. Instagram is completely based on the ReactJS library and has let fans fully adapt to its amazing features.

The React version works with Netflix too – specifically on their platform called Gibbon which is used for low-performance TV devices instead of the DOM used in web browsers. Netflix has even published an official blog post explaining how the ReactJS library helps their startup speed, runtime performance, modularity and various other advantages.

The New York Times has designed a great new project that simulates different looks of stars on Oscar red carpet. Obviously, this project’s interface was built in React and lets users filter the gallery of different photos from 19 years in a nice way. The re-rendering on this project is only one of the impressive features we can thank ReactJS for.

Surprisingly (or not), Yahoo!’s mail client also uses React. Since Facebook owns Yahoo! nowadays, the idea of a solid and unified architecture is there, and that is why React was incorporated in as many bits and pieces as possible.

Facebook’s $19 billion acquisition of WhatsApp sounds smarter and smarter. CEO Mark Zuckerberg announced that WhatsApp now has 1.5 billion users and sees 60 billion messages sent per day. The WhatsApp uses ReactJS for building user interfaces from Facebook as it's most efficient engine.

PayPal provides online payment solutions to its users worldwide. The origin of the infamous Paypal Mafia that has founded companies like Youtube, Palantir, and Tesla, all giants in their own right. They were Acquired by eBay on July 8, 2002

Uber is a mobile app connecting passengers with drivers for hire. This ferocious company brought digital matching firms to mainstream usage. They’ve swept up the taxi hire industry and been the inspiration for hundreds of ‘Uber for x’ startups that aim to bring luxury services to the middle class. They raised $12.51B in 15 Rounds from 56 Investors.

Airbnb is an online community marketplace for people to list, discover, and book accommodations around the world. They’ve raised $2.39B in 8 Rounds from 32 Investors.