This (admittedly old) question on meta.SO concerns the handling of answers which contain a link and essentially nothing else. There are some varied opinions on how to handle such answers, ranging from upvoting (the view that as long as the answer to the question can be found at the link, it's fine) to flagging as "not an answer" (the view that "outsourcing" the burden of answering to another site is effectively useless).
Since physics is somewhat different from programming, it occurs to me that the discussion on meta.SO might not be completely applicable to this site. What does the physics.SE community think of link-only answers? Do we upvote them, edit them, downvote them, flag them, etc.?