It is essentially a stricter, more modern dialect of PHP, allowing the company to move faster while maintaining stability. The development of HHVM was a strategic move to optimize performance and differentiate their infrastructure.
Future Facebook Language Strategy Direction and HHVM's Role
CSS/HTML: The standard languages for structuring and styling web pages. Understanding what language Facebook is written in provides insight into how the platform handles billions of interactions every day.
Supporting Technologies and Frontend Development Although the server-side logic revolves around PHP and Hack, Facebook relies on a vast array of other technologies to deliver the complete user experience. For the user interface, the frontend is largely built using React, a JavaScript library developed by Facebook engineers.
Future Facebook Language Strategy Direction and Implementation
When you click a button, load your news feed, or search for a friend, the server processes that request using PHP code. This creates a full-stack environment where the backend logic written in Hack communicates with the dynamic frontend rendered in the browser.
More About What language is facebook written in
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