I am confused. Anyone understand this new 3-D Facebook app?

I think only one image is taken and some clever software does a 2d to 3d conversion and and as the smartphone tilts you can see slightly behind the main object in the front of the image. What is interesting is you can not only see around the sides of the object ( as in a standard stereo wiggle effect ) but also see over the top of the object as the smartphone is tilted so that the top of the smartphone comes towards you. - very clever.

I found this info which gives an insight to what is going on.

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Take Better 3D Photos for Facebook

You'll quickly notice that not all of your portraits will look good as 3D Photos on Facebook. To make sure yours look better, follow some of the below tips, which will also make better portrait photos in general.

1. Put your main subject at least three or four feet away from your phone.
2. Capture scenes with at least three layers of depth: foreground, your subject, and background.
3. Don't let your subject blend in with the background — use contrasting colors to make them stand out, and therefore pop in 3D.
4. Make sure the subject has some texture, as it won't pop as much without it.
5. Shoot subjects with solid edges, so there is a clear line of separation between other depth layers.
6. Avoid shiny objects, which could
7. Avoid transparent objects, such as glass or plastic, which could fool depth sensors.
8. Avoid added effects, like scene lighting. Portrait Lighting mode on iPhones may also work against you.
9. Avoid mono-style lighting that drowns out all of the colors that makes 3D photos stand out.