And by the way, since that's the original topic of your blog: I like people upvoting comments, but I have noticed it's not THE reason I comment on blogs. I comment when I feel there's a reciprocal relationship, I don't do 'fan comments' (I like some in return too, or else I don't feel like investing in the 'relationship' much).
I mostly upvote and comment who have left a comment on my blog, because I read comments on my blogs and then open their accounts. I go through those accounts tab by tab and if I see a post I like I open, read, upvote and comment it :-)
I do feel it's not a perfect strategy because I know a few people I LOVE to upvote and they are too busy to comment on my posts, but those I might catch late at night while I go through my feed spending some random upvotes on people I like - but they don't get a comment because I'm already in bed horizontally which is not an ideal typing position ;-)