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Are answers that just contain links elsewhere really “good answers”?

If someone just writes a link on their answer (without any summary), should I downvote? What if the link is useful?

Example: "This pretty much sums it up."

[note] I've seen one mod down-vote such an answer.

marked as duplicate by random Jan 17 '11 at 14:40

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This pretty much sums it up. :)

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