Back in February 2018, Facebook began allowing 3D glTF 2.0 images - and they were head-over-heels excited about it! And then, on June 12, 2019 they deprecated it.
Not to worry, though… they still allow a shitty 3D Photo substitute, and they're doing other VR kinds-of things, too.
That said, you'll need a good tutorial on the various ways (from "good" to "much better") of producing the nearly useless 3D photos. Try this tutorial - it's clear, easy, and well-explained: