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5:58 AM
Speaking of spam this answer is a spam post which remained on the site for more than five hours. (It should be visible to 10k+ users, I am just going from the timestamp listed in the list of my flags.)
But I guess that typically it only takes limits.
Also in this case, the answer was removed very soon after it was reported in Charcoal HQ:
in Charcoal HQ, Jul 7 at 5:44, by SmokeDetector
[ SmokeDetector | MS ] Manually reported answer (94): Spanning trees in 3 regular graphs. by Richard Majece on mathoverflow.net
MetaSmoke says: "deleted 3 minutes after being reported".
 

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