In general there are a few very good reasons: + It gets flagged by sufficiently many people who believe it to be inappropriate + It comes from a known blackli

In general there are a few very good reasons: + It gets flagged by sufficiently many people who believe it to be inappropriate + It comes from a known blacklisted site + It falls foul of behavior most commonly associated with spam. The case in question here is in the last of these. I submitted the comment, realised I'd put it in the wrong place, deleted it, and immediately reposted in a different comment. That's behavior adopted by spammers - posting identical comments in several places in a very short time span. Spending long enough here, and thinking about it carefully, most cases can be analysed and understood.