Surely you know about the "infoboxes" Google now places next to (many)
search results:
https://en.wikipedia.org/wiki/Knowledge_Graph
There's been a lot of speculation around the effects they have on the
resources they link and pick data from, I'm not so interested in
continuing with that.
What I've been looking for in the last few months without success is an
authoritative list/timeline of the languages/countries the feature has
been enabled or expanded for. As you can see on the article, we only
know that it was introduced in May 2012 and expanded to 7 more languages
in December; and, per one blog, expanded a lot in July 2013. This is not
enough.
If you know any important date/event/whatever, please add to the
article (or to the talk page or here if you have no source).
Nemo