Your right! spammers are annoying.
There are many abusers and so the first idea is just to keep a list of them. But the list gets so long! ;-)

Have you heard of the Chrome browser add-on called Steem Plus?
I use it, and it's really great for helping me identify spammers.

I just wanted to point out that Steem Plus is keeping a "community polling" + "heuristic analysis" database and it seems to work fairly well. You will actually see in your comments to your post, which commenters are probably spammers..