Facebook has a new option to post a 3D photo. I have seen a few of these photos. It's fun to look at. They aren't really 3D but they have depth that you can see from different angles.
Here are a few examples
a little FYI :
"3D Photos use the depth maps that are stored with “Portrait” photos taken on iPhone 7+, 8+, X or XS. "
So you according to this it must only be available on iPhone's 7+ or older.
I made this little gem below over a year ago. It's a video but kind of has a parallax effect that is similar to a 3D pic.