If the Facebook window on the Home page is an empty space, you may be using Apple's browser, Safari.
Here's how to fix this on an Apple laptop or desktop:
1. From the Safari menu, select "Preferences..."
2. Click the "Privacy" button and un-check the two preferences at the top
.3. Quit and restart the browser.
Here's how to fix this on an Apple iPhone or iPad:
1. From the Settings, select "Safari."
2. Scroll down to "Privacy & Security"
.3. Turn off "Prevent Cross-Site Tracking and Hide IP Address"