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It can't hurt letting them know. I like that Approach.. @steevc

Unfortunately spammer most like won't care at all, and just keep copy-pasting it into other posts.

If they keep getting flagged then they may take notice

We can hope so! In my opinion, the biggest problem is that some of these spam comments get upvotes for a few cents, which I think is enough to keep the spammers going even if their reputation gets destroyed by flagging.

I hope the Steemit devs will give us a feature to block/blacklist certain users in the future.