So, editing and answering old questions is encouraged on stackoverflow and imho it is a good thing, nothing is more annoying than googling for a question and only finding answers in old mailing lists that apply only to a compiler/system/language from the '90s.
I absolutely agree.
We should not be shy to suggest D on old posts where it's missing despite it's nowadays a very good alternative to C, C++, Python, Ruby, etc.
And D is also a perfect language to teach programming, and that information is often missing when googling on the subject.
That also must be said on the forums, including on existing posts.