As far as the comment spam, you might want to check out steemplus addon for chrome/firefox. It lets you designate people as 'Human,' 'Bot,' 'Spammer.'
Hypothetically flagging people in this sincerity database will clue other people in that this person probably sends out 1,000 a day so don't bother.
Picture related,

I would assume that the small votes are a curation trail.
The most I've ever made off curation for a day was 0.14SP, i was pretty happy :D
But if someone follows multiple trails they may be downscaling their vote proportional to the leaders vote in weird ways so that could explain some microvotes that don't really make sense. Idk how reputation works, does it at least give you a small boost there?
Edit: Song for the bots, https://soundcloud.com/nick_1-1/ghost-in-the-shell-stand-alone-complex-ost-scott-matthew-be-human