When I click on any tag in SO, it return zero results.
This post for example have the tags: windows, c, select, stdin, multithreading.
When I click on any of the above tags, except c tag, I got this page, which is tell me:
You are on the Featured tab.
There are no Featured questions in the windows tag at the moment.
Perhaps you'd like to select a different tab?
So, now I'm actually reading, and understand what going on..