Comment 3 for bug 1423585

The list of types at http://ogp.me/#types is extremely limited. We could special case a "if schema book, then just book" but I highly doubt it's worth it. Otherwise, outside of video, music, article, and book, everything is a website. That's just dumb.

And, really, most sharing sites only care about title, image, and url, because the OGP types are almost useless. In the end, OGP is RDFa, so schema.org types are technically valid, and I'd rather express the greater richness of schema.org here.