How the "Infinite Scroll" Was Created
In the early 2000s, the internet was like a bulletin board. You would enter a site, read the information, and leave. Facebook introduced a revolutionary concept: the News Feed.
From a technical standpoint, this was a massive challenge: how do you show billions of users individually generated, constantly updating information without reloading the page? This is exactly where the web’s transformation from static pages to living applications began. Facebook was one of the first to implement and refine asynchronous data loading (AJAX), laying the foundation for the modern internet.
Today, when you "scroll" through a social network and the content never ends, it is thanks to that technological breakthrough which connected human psychology with algorithms. Today, the algorithm decides not just what is new, but what is relevant to you at this specific second.
React.js – The Code the Modern Web Stands On
Few people know that Facebook's greatest legacy isn't its blue interface, but the code standing behind it. In 2011, when the company faced scaling issues, they created an entirely new tool: React.js.
Before this, websites were heavy and inflexible. React introduced the concept of the "Virtual DOM." Simply put: when you click "Like" on Facebook, the browser doesn't reload the entire page; it only updates that tiny button. This made websites incredibly fast.
Today, Netflix, Airbnb, and most of the world's leading platforms run on this technology, which was created by Facebook and later became Open Source. This is a prime example of how solving an internal problem can change global industry standards.