A 360 image hosted on FB is in the format of a horizontal strip of 6 square faces.
First flip the strip horizontally .
then crop each face (6 of them – we make a cube later)
The order from top is : Right-Left-Up-Down-Back-Front.
Top and Bottom images need to be rotated 180,
After Each face is saved and optimized – host them and call each face in the <room script
See This FB image as a Room here http://vrsoda.com/VRWEB/vrsodadaily/26/VRSodaDaily_26.html