Everyone seems to be focusing on the .gov site but if you take a look at the Stack Overflow home page, the page that would normally get indexed highly, there is very little telling Google what it is. There is no tag in the header. The H1 tag, important to Google, says "Top Questions". The content of the first page constantly changes. Plus, I would bet that most of the links into Stack Overflow are to individual artic…
Not sure I disagree with SEO on "Stack Overflow" who is googling for that term? Practically any technical question I've searched for has resulted in a stack overflow (or super user) #1 result. I'd say they are doing a pretty good job, even if they don't do all the old school SEO stuff
Brand Searches drive a lot of traffic to major sites people are lazy and use Google instead of bookmarks