Funny thing, I was lying in bed and it occurred to me that your post might have been about SketchUp for Schools. That would make Tori’s answer more correct. But don’t worry, I came back to show you another option…
While looking into what there was I found this tool. It can convert OBJ, FBX, or DAE, to GLB:
I think you can export from the Schools version of the web app to any of those three formats, so try each one to see how they come out as GLB. Collada might be the easiest one, that would then also work with models downloaded for 3D Warehouse.
For a while Facebook allowed posting of GLB models. That’s gone away now, but there are still some conversion tools, like this one.