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I think its different on a composed blog post and an informal comments section. If you want to be taken seriously as a writer, then sure, have your act together. On a comments section, I find that the rules are (and should be) a lot less formal--conversational, perhaps. The only people who seem to correct others in a comments section are trolls, and people who are devoid of quality arguments. Now if you're talking about errors of judgement or factual errors, then I'm with you 100%.