wickedFauna said:
Alternatively, you upvote more posts because you're smart and you pay less attention to the things you would downvote unless the evoke a specially strong reaction, which is also natural.
I understand that "like" and "upvote" aren't perfectly interchangeable, but the logic stands.

Yeah, I upvote pretty much anything that interests me enough to click on and I look at and go "yeah that's pretty good" or "that looks cool". I'm very loose with them because I have my favorites for posts I really like. Whereas downvoting, a post has to really irritate me to warrant it, since otherwise I just feel bad for reducing the score on an otherwise perfectly fine image. Anything I don't really have a strong opinion on I don't vote on.