Upvoting a comment?

There is those badges containing Upvoting, e.g. "Upvote your first comment".

Didn't find any button for upvoting comments anywhere though...

Is the upvoting function disabled or was it removed from the website?

Or am I just too blind to find it?

If it is disabled, could you tell me why it was done so? I'd really appreciate that forum function, would improve thread commenting a lot.

I think it refers to comments in the Blog and Release pages, rather than Forum posts.

Uh, that'd be sad, I'd really appreciate an upvoting system in the forum...