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Well, I guess shilling any obvious scammy coins or icos counts as scamming... haven't run across any recently so I can't give an example right now as I don't really venture into those tags much. I'll be sure to drop by if I see any of the other categories though, thanks.

Does https://steemit.com/@nextgen622/comments voting like this
http://www.steemreports.com/outgoing-votes-info/?account=nextgen622&days=31 count at all? He used to self-vote for over 20 on trash comments.

I can only imagine the less voted on garbage is just as bad as the most voted on garbage.

Probably plagiarism.
https://steemit.com/@ffcrossculture

Literally just copy-pasting article links.
https://steemit.com/@twitternomore

Copy-pasting bible verses.
https://steemit.com/@joy2018t

Some of it seems to be actual authors.