While Facebook uses a highly dynamic architecture (specifically React and GraphQL), inspecting the source code can reveal several key technical components: 1. Document Structure
If you want to understand how Facebook works, the raw view-source view is incredibly limiting because it only shows the initial code sent by the server. It does not update when you scroll down, click a button, or receive a new notification. Instead, use : view sourcehttpsweb facebook
Facebook doesn't let people track who views their profile. Third-party apps also can't provide this functionality. How To Check Who Viewed My Facebook Profile click a button