Add Stack Overflow link for doc support page.

support.md

@@ -6,9 +6,13 @@ id: support
 
 **React** is worked on full-time by Facebook's product infrastructure and Instagram's user interface engineering teams. They're often around and available for questions.
 
+## Stack Overflow
+
+Many members of the community use Stack Overflow to ask questions. Read through the [existing questions](http://stackoverflow.com/questions/tagged/reactjs) tagged with **reactjs** or [ask your own](http://stackoverflow.com/questions/ask)!
+
 ## Google Groups mailing list
 
-<a href="http://groups.google.com/group/reactjs" target="_blank">The **reactjs** Google Group</a> is the best place to ask questions and find answers.
+<a href="http://groups.google.com/group/reactjs" target="_blank">The **reactjs** Google Group</a> is also a good place to ask questions and find answers.
 
 ## IRC