[mbreese]

I don't know... HN has a history of actively downvoting memes. I don't know if 'This.' qualifies as a meme or not, but it's a valid sentiment.

Then again, if you are replying "This." perhaps the better way to go would be with a simple upvote. But that would really only be expressive if we could see vote counts again.

[younata]

My point was that "this. <explanation and clarification>" does not deserve a downvote (should get an upvote), because it has actual content.

However, a content-free message of simply "this." does deserve a downvote.