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What do you do if the answer to a question you have asked is no longer valid due to changes made by the website? For example this one about YouTube.

marked as duplicate by John C, ale, Jacob Jan Tuinstra, phwd Jan 29 '15 at 20:15

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Downvote it and leave a comment that it's no longer valid. You should post a new answer with updated instructions

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    Unless, I would say, when the question was asked in context of a certain version of the application that still exists in parallel. – Christiaan Westerbeek Jan 26 '15 at 17:25
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    @ChristiaanWesterbeek yeah, that's fair – Sathyajith Bhat Jan 26 '15 at 17:34
  • I really don't think it's nice to the answerer to downvote an answer because the website / application has changed since then. – Franck Dernoncourt Jan 28 '15 at 5:06
  • @FranckDernoncourt the downvote will serve as an indicator to update the answer. Once updated the downvote can be revoked. – Sathyajith Bhat Jan 28 '15 at 5:08
  • @Sathya How about just adding a warning at the beginning of the answer? – Franck Dernoncourt Jan 28 '15 at 5:09
  • @FranckDernoncourt what's the point? Answers on Stack Exchange should strive for accuracy. An answer with a warning doesn't do any good, might as well delete it – Sathyajith Bhat Jan 28 '15 at 5:14
  • @Sathya I am not sure that it's the best way to keep contributors: maybe just deleting / greying out their answers but keeping their reputation points? – Franck Dernoncourt Jan 28 '15 at 5:17
  • @FranckDernoncourt you get to keep rep on deleted posts provided they have been around for 60 days, and have a score of 3 – Sathyajith Bhat Jan 28 '15 at 5:52
  • @Sathya Interesting, thanks, I didn't know. – Franck Dernoncourt Jan 28 '15 at 6:20

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