add a q&a about google's internal use of go

R=rsc
CC=go-dev
http://go/go-review/1026035

doc/go_faq.html

@@ -89,6 +89,20 @@ if they enjoy it. Not every programmer
 will, but we hope enough will find satisfaction in the approach it
 offers to justify further development.
 
+<h3 id="Is_Google_using_go_internally"> Is Google using Go
+internally?</h3>
+
+<p> The Go project was conceived to make it easier to write the kind
+of servers and other software Google uses internally, but the
+implementation isn't quite mature enough yet for large-scale
+production use.  While we continue development we are also doing
+experiments with the language as a candidate server environment.  It's
+getting there.  For instance, the server behind <a
+href="http://golang.org">http://golang.org</a> is a Go program; in
+fact it's just the <a href="/cmd/godoc"><code>godoc</code></a> document server running in a
+production configuration.
+
+
 <h3 id="Do_Go_programs_link_with_Cpp_programs">
 Do Go programs link with C/C++ programs?</h3>