They do support Go for Glassware development, too, but these are just exceptions. If you search for jobs in Google you are not going to find any vacancy requiring Go programming, while you can find such vacancies in companies like Soundcloud, Cloudfare, Songkick, or Reuters. Also i would like to see Go natively used for Android development. Then i would probably reconsider the "behind it" statement.
The fact that Google blogs about rewriting some of it services in Go internally and it employs full time Go primary creators is worth 100x more than Soundcloud, Cloudfare and Songkick combined job boards.
The point is publishing that constitutes good advocacy and implies expected future support for Go. A lot of people given the choice between learning multiple languages will factor a company like Google supporting and using Go in their decision.
I am sure if Google published on it blog that it rewrote some of its services in Nimrod, there would be a bump in popularity.
Of course it is implied that there is future support for Go since there are serious people behind Go who are Google developers but its current popularity comes from various implementations of the language and "rewritings" which are translated into blog posts rather than blog posts per se. I hope the difference i am trying to point out is obvious.
