A large or well-known company merely using a programming language, and maybe even contributing back to it and its community, isn't the same as the company truly supporting or championing it.

What you describe is very different from, say, how Sun pushed Java, or Microsoft pushed C#, or how Apple will likely push Swift, or how a huge portion of the entire software industry pushed C and C++.

Facebook's Hack language is probably a much better example than D is of a language that they're actively supporting. It's a creation of theirs, rather than just a creation of somebody else's that they find useful in some limited cases.