Safari doesn't load Facebook properly

It's AdBlock. 😟

Disable it in Safari Preferences, reload the page and I think you'll find it works fine.

If you click on the AdBlock icon on your Safari bar (whilst it's enabled - it disappears when you disable it) it's saying there's a new AdBlock for Safari to download. This may be the solution, but I saw yesterday somewhere a comment that you could's customise it with whitelists etc, which would be useless. Haven't tried it out yet, but may have to.

Try setting up another admin user account to see if the same problem continues. Please post back on whether or not this worked. Also try the Safe Mode. Please post back on whether or not this worked.

Isolating an issue by using another user account

Safe Mode - About

Safe Mode Startup – El Capitan. also Sierra

If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown.

Etrecheck – System Information