The "view-source" of m.facebook.com/home.php reveals a highly optimized, engineering-heavy document designed for speed and security on mobile connections. It prioritizes delivering the JavaScript framework required to run the app-like experience over easily readable HTML markup.
Facebook's own Open Graph Debugger tool ( developers.facebook.com/tools/debug/ ) internally uses similar mechanisms to fetch and analyze page source code. View-sourcehttps M.facebook.com Home.php