Export to glTF with PBR materials ( facebook integration) I'm experimenting with 3D posts on Facebook on the only supported format is binary glTF. I'm using the Khronos exporter and their PBR node groups.
Has anyone been able to export a model with PBR and display it on facebook?
I get: 


the model without my PBR material when I use the Metallic Roughness node tree
an "GLB File Invalid" error from facebook when I use the Specular Glossy node tree


Am I missing something? Thanks!
You're doing good to use the PBR node inside Blendere but include the textures (make them internal), then save the .blend file.

THEN export to .GLB, it should work. Relative path issues mess the drag-drop on Facebook post.