Why is not advisable to remove spam links? such as the following:


I removed the URL but for some reason it has been put back.

And also I noticed that the tag 'pi' has been put back, but I had removed that tag.

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    $\begingroup$ why you consider it spam link, actually?.. btw, revision history says that it was Isaac♦ who did rollback $\endgroup$ – Grigory M Aug 21 '10 at 10:37
  • $\begingroup$ (but I hope that question will be deleted) $\endgroup$ – Grigory M Aug 21 '10 at 10:52
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    $\begingroup$ I don't think that link is a spam (undiscriminated bulk advertisement). In fact, the link is used as an argument for the OP to consider π harmful. $\endgroup$ – kennytm Aug 21 '10 at 11:24
  • $\begingroup$ Also, why do you want to remove the tag? $\endgroup$ – kennytm Aug 21 '10 at 11:27
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    $\begingroup$ Look here, math.stackexchange.com/questions/tagged/tag-removed tag-removed makes it easier to avoid coming rubbish when you are searching. It's useful to detag these sorts of questions then. $\endgroup$ – anon Aug 21 '10 at 11:41
  • $\begingroup$ @muad: If you want to avoid closed questions, just add closed:0 to the search term. $\endgroup$ – kennytm Aug 21 '10 at 11:49
  • $\begingroup$ @muad: If this question is so bad that it should not come up in search results for the pi tag, then it should be deleted. But I think that the question, regardless of its quality, is definitely about pi. $\endgroup$ – Larry Wang Aug 21 '10 at 16:46

If a question or answer does contain a spam link, please remove it.
In this case, it appears that the link is being used as a reference for a question, and indeed, the text of the question:

Reading the post by Michael Hartl, it sounds rather convincing. Taking circumference to diameter ratio, as opposed to radius, looks like a historical mistake.

Do you have other opinions? Welcome to the community wiki.

seems much less useful without the link. Anyone who wants to answer such a question will likely end up searching for the same link themselves.

Now, if the question itself is just a spam question intended to promote the tau manifesto site, that's a different story. I don't see any reason to conclude this yet. It seems plausible that this is a real question that someone wants to know the answer to.

As for retagging the question tag-removed, any question that is so bad nobody would want it to come up in their search results is best deleted. For example, a question that is so off-topic it fits no existing tags, and was mistagged by the person who asked it. Vote to delete such questions, or flag them for a moderator to delete.

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