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It's a bot, just letting you know. They can run a script to detect high value post and comment generic stuff like "Wow, good informative post, thank you for this, blah blah blah". Getting very annoying as Steemit is getting more popular.

At least they’re smart enough to have the bot not duplicate the exact same comment dozens of times. Would definitely be flagged for spam in that case.

Unfortunately, yeah. Really not appreciating such lifeless comments.