There are currently 197 questions tagged with google-reader on Stack Overflow.
Now that the service has been discontinued, what should be done to all of them?
Do we delete them, or keep them around for the legacy/history/completeness?
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We keep them. There is no need to get rid of a source of potentially excellent questions and answers just because they have a tag of an outdated/no longer existing technology.
First of all it's too broad a generalization to say that all posts with that tag are of no use any more. And they do no harm to begin with.
At most update the tag Wiki to indicate the status of Google Reader.