You know, "+1" usually has only one meaning:Nonsense.
- Agreement: "I agree with whatever you're saying"
- Contributory : "I don't agree with what you're saying, but you elaborated your point *very* well and contributed to the discussion"
- Mercy: "I don't agree with what you're saying, but the hivemind punished you for no good reason, have an upvote"
- Popularity: "I like you and will +1 anything you write"
- Thanks: "I like what you did even if this post isn't relevant"
The second and third one are very common on sites like HN, certain places on Reddit, and Stack*
Downvotes have:
- Disagreement: "I disagree with what you're saying"
- Anger: "Fuck you, have a downvote"
- Doesn't contribute: "I might agree, but you're not helping the discussion"
- Incorrect: "This isn't about agreement, your advice is wrong and/or harmful"