I try to do my best to upvote good comments or comments from good friends and close followers. Random comments that appear 30 seconds after posting an article that takes 5min to read doesn't get my attention or vote.
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I don't often see comments that long just after an article is posted, but that does give for a big red flag indeed. If your talking about spammers, most of them use a few words or lines and they can usually be spotted right away by checking their comment section.