Comment 4 for bug 1423585

Oh, and Facebook's own docs say: "You can also specify your own types via Open Graph." https://developers.facebook.com/docs/sharing/best-practices

So that's what we're doing. If you want to see a better making of schema types to the native available OGP types, I could consider that an acceptable bug. But I don't think it's a necessary precondition for merging.