Sourcehttpsweb Facebook: View
In Chrome DevTools, the Sources tab lets you see the JavaScript files Facebook loads. You can "pretty print" them (click the {} icon) to reformat the minified code into something semi-readable. You will see file names like 7iZQ4nP5.js . These are intentionally hashed to prevent easy identification.
If you are looking at Facebook's source code because a tutorial told you it can reveal who has been looking at your profile, view sourcehttpsweb facebook
If you want to see the actual text on your screen (like a comment or post ID), you need the , not View Source. In Chrome DevTools, the Sources tab lets you
By examining Facebook's source code, you can gain insights into: The HTML at the top of the file—the
It wasn’t a refresh. The HTML at the top of the file—the standard header—suddenly gained a new line of code that hadn't been there three seconds ago. It inserted itself right below the <body> tag.
If you view source, you see the skeleton. If you use your browser’s (F12 → Elements tab), you see the live DOM after JavaScript has executed. But that live DOM is not the source; it is the result of the source.
Reality: The algorithm runs on Facebook’s servers. The source code you see is client-side code for rendering the UI. The ranking, filtering, and ad auction logic are hidden behind private APIs.