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I'm not speaking for the moderator collective here, but I'm personally in favor of adopting Andrew Stacey's broader notion of spam, with respect to flagging criteria. That is, if a post is very off-topic, I don't see a problem with flagging it as spam. This is in the interest of keeping the signal-to-noise ratio reasonably high. You should definitely use discretion, though.
If I'm not mistaken, Bill Dubuque's answer to this question is the deleted post that yielded most of the current long discussion. It is related to the above paragraph, because the answer was over 95% off-topic noise. I genuinely appreciate Bill's mathematical contributions here, but I would prefer if he broadcast his artful wordplay somewhere else.
Hmmm. That was pretty much the definition of spam I was using. I guess I can drop it and readopt it. :)
Bill, terms like abusive, juvenile, vengeful, sordid affair, cohort &c simply do not help at all... :/
To be honest, if someone picks flagging a MO post, out of the myriad of possibilities available, to be abusive, vengeful and sordid, well... can't we just giggle a little bit, marvel at his/her utter lack of imagination and almost heart-warming naïveté, and pass on to more interesting matters?
Andy is right: the SE guidelines mentioned above are for flags, which I take to mean the "flag" link next to the "close" (or "reopen") link. On the couple of occasions when I have flagged a post as spam, I would like to believe that the "spamness" was not subject to interpretation, and any ill consequence my flag could have on the spammer are wholly deserved.
When it comes to closing questions as spam, on the other hand, a liberal interpretation of what is considered spam is fine, as "closing as spam" should have no lasting effect on the person posting the question. (Someone more knowledgeable about the inner workings of the site can correct me if I'm wrong.)
As for deflecting "spam" to math.SE, I really don't think that is a good idea. We are not trying to undermine them and if we think of a question as "spam", then chances are they would too. It's a different story for questions deemed "too localized", for example. I think the best course of action towards questions we feel are inappropriate for MO is to close them, after offering some explanation and, if appropriate, links to other sites. But if someone insists on asking inappropriate questions, despite the community's objection, then it is fair to ask the moderators to intervene.
For the record, I think that applying SO policies here is generally a bad idea.
I would have to agree with Harry on this. In fact, the nature of the banter in some of the comments associated to the meta.stackoverflow questions which Bill Dubuque linked to in his first contribution to this discussion is precisely the sort of thing we are trying hard to keep away from MO.
Bill, the SO policies do not necessarily apply to MO. This does not mean that the SO policies are bad, but that MO deals with a very different community. The MO policy standard is to keep the rules and guidelines short and simple. Since there have been too few incidents of abuse of the spam/offensive flags (one of which is you were the unfortunate victim) we have not yet felt the need for official guidelines on their use.
Bill: Can you honestly tell me you see nothing inappropriate (for a site such as what we are trying to build here) in, for instance, the following exchange?
CW before I downvote, will ya? – Ladybug Killer Jul 22 at 14:20
@LadybugKiller: sorry, i thought i had checked it – Kip Jul 22 at 14:23
@Lady: while you are free to downvote for any reason you want (even no reason), I think downvoting because it's not CW is unfair. There are LOT of FAQ questions that are not CW including one by Jeff Atwood (that gave him 850 rep) – Kop Jul 22 at 14:23
@Kop: We all know that Jeff is a cheater. I don't care about fairness, I downvote at will. Besides that I haven't downvoted. So stay cool. – Ladybug Killer Jul 22 at 14:26
meta.stackoverflow.com/questions/58034/… – Kop Jul 22 at 14:28
@Kop @Kip: stop trying to destroy my brain, will you? – Popular Demand Jul 22 at 17:45
@Pip: Is there something left to destroy? – Ladybug Killer Jul 22 at 17:48
Bill: The existence of those remarks means that such discourse is condoned in the site. I would imagine that this is a direct consequence of the site's policies. After all, what are policies for, if not to determine the sort of interaction one wants in the forum? That being the case, and since I would not like to see such discourse in MO, I do not think that those policies are to be emulated here. That's all I meant.
A somewhat belated comment on the best target for redirecting spam:
spam >/dev/null
@Jose: I don't buy that argument. There are likewise plenty of existing comments on MO that we certainly wouldn't want people to think are condoned here. It should come as no surprise that perhaps a few disgruntled SO people - perhaps those adversely affected by those very policies - might feel the need to grumble in the Q&A FAQ thread on the policy. I don't see any correlation between that and the value of said policy.
My interpretation of "close as spam" is that the author is more interested in asking new questions than digesting answers/response to their existing ones. When one writes a referee report for an article, pointing out a false or facile statement, and then later receives a request from another journal to referee the same article where the statement has been left unchanged, one is tempted to conclude that the author simply doesn't care about content, merely about communicating their excitement or fervid enquiry. In the particular case of the coset question, I was swayed by my reading of an earlier (non-)question raised imprecisely and cavalierly by the same user.
NOW WE SEE THE VIOLENCE INHERENT IN THE SYSTEM
This "Secret Blogging Old Boys Network", which I have seen mentioned above, does not seem to have overly affected the penetrating responses and wisdom given by the likes of W. B. ("Bill") Johnson, nor the interesting viewpoints evangelized by Dmitri Pavlov, nor the diligent industry of Jonas Meyer, nor the astute analyses provided by users such as Greg Kuperberg or Brian Conrad or Fedja (Nazarov?).... But perhaps these facets of MO are not being counted for sampling purposes when we come to foundations for rhetoric.
@Yemon: I don't get the reference.
Harry: it's from Monty Python and Holy Grail. The obligatory youtube link: http://www.youtube.com/watch?v=o76WQzVJ434
Incidentally, that came to mind when I was reading the third post, but I, for some reason, thought of the holy hand grenade scene.
@Yemon: Have you ever been a member of another virtual mathematical community that has died? If so then perhaps you might be more sympathetic to some of the issues that I raise. Bootstrapping the community is always the easy part because usually the founding members already share common values and strong communication channels from their prior interactions. However, as the community grows and develops much more diversity then one immediately confronts many of the issues that I raised. Whether or not the community succeeds in the long run usually depends heavily on how such issues are addressed. At least that's my experience after having been involved in many such forums over a few decades.