I need to mentioned that not all Facebook users have the 3D Photo function enabled. After a lot of checking and testing, I discovered that my account does not have the function enabled yet. If you cannot upload 3D Photos, you cannot use the depth-mapped image pair to create the fake parallax effect, which is basically what these "3D images" are in your Facebook timeline.

For Poser users: I also want to point out that if you don't see your depth-mapped or Z-depth option in your regular Firefly render control menu, please go to Scripts | Partners | Dimension3D | Render Firefly --- a menu wil pop up which allows you to access the Z-Depth rendering.

Eternal Hobbyist