Why doesn't the search textbox return searches from all the different Stack Exchange sites? There are so many of the Stack Exchange sites that are very similar, for example a question may have been answered under Server Fault, but the user is looking under Ubuntu because they happen to have an Ubuntu server?
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The reason that search doesn't return results from all Stack Exchange sites is because there are many site-specific operators in search. For example, I may search for
It should be noted that, for example, a question from English.SE should probably not appear on searches from, say Ubuntu.SE (Although I can't easily think of one that would).
Given that, however, it would be nice if questions could be tagged as spanning multiple sites. So the question being referred to in the request could be tagged as ubuntu on serverfault, and should show up on Ubuntu.SE.
Also, as waiwai933 pointed out, user queries cannot (or should not) span multiple sites, but in this case would be unaffected, since the search engine would only look at questions tagged with a specific tag.
The more I think about it, the more I realize that it could be a great feature. Maybe add a section below regular results, or even a "search all StackExchange sites" option...
EDIT: Okay, I see that the stackExchange search box says that. I should have said "search all StackExchange sites for related questions"
I really don't know how to phrase it, but the general idea is that searching for servers on ubuntu will also search for ubuntu on serverfault. Searching for programming on apple will also search for mac and iphone on stackoverflow. etc. etc.