There is some irony in then-Facebook's proprietary metadata lines being in there (the "og:..." lines). Now with their name being "Meta", it looks even more proprietary than before.

Maybe the name was never about the Metaverse at all...

Are they proprietary? How? Isn't open graph a standard and widely implemented by many parties, including many open source softwares?

They're not, at all. It was invented by Facebook, but it's literally just a few lines of metadata that applications can choose to read if they want.

Being invented by $company does not preclude it from being a standard.

https://en.wikipedia.org/wiki/Technical_standard

> A technical standard may be developed privately or unilaterally, for example by a corporation, regulatory body, military, etc.

PDF is now an international standard (ISO 32000) but it was invented by Adobe. HTML was invented at the CERN and is now controlled by W3C (a private consortium). OpenGL was created by SGI and is maintained by the Khronos Group.

All had different "ownership" paths and yet I'd say all of them are standards.

Did you mean to type "does not" in that first sentence? Otherwise, the rest of your comment acts as evidence against it.

Yep, it was a typo. Thanks! Fixed.

The Open Graph Protocol was thrown over the wall by Facebook and promptly abandoned. It’s an atrocious spec, a good chunk of what it did (and most of what people actually wanted from it) was already unnecessary (og:description, for example, is stupid), its data model makes several woefully bad choices, it’s firmly based around Facebook’s interests (especially pictures!), it’s built on standards that were already looking like they were failing and are definitely long abandoned now, and I don’t think I’ve seen a single page implementing OGP tags correctly in the last five years and I’m not confident that a strictly correct reader implementation even exists (the specific matter I have in mind pertains to the prefix attribute). Also a bunch of key URLs have been 404ing for many years now.