[citricsquid]

Like / Dislike is the rating system evolved, there was an article about how they had come to the decision through research that a 1 - 5 rating system doesn't work; people more often than not either like it or they dislike it, so 1 and 5 were the common votes.

If you want to be pedantic then sure, they removed a core part of Youtube when they removed the rating system, but in reality the system evolved. 1 - 5 was (at it's core) a way to rate videos: like / dislike is (at it's core) a way to rate videos, the interface and finer points are different but it's still the same thing overall.

[capo]

Then it could well evolve further. I don't see a need for the "dislike" button.

[luser001]

His point was about requiring a login on another social network to vote on a video, when you're already logged in to Youtube.

You somehow boiled it down to a discussion on the lack of a "thumbs down" button. I think you're off track here. YMMV.

[capo]

What "other social network"? Google, + ,and YouTube accounts are on their way to becoming one (if they aren't already).

[sp332]

Google doesn't care what info you put in when you sign up for a "normal" account, they just use it to correlate interests for ads and recommendations on the site. But to sign up for Google+ you have to use your real name or risk being banned.

[taligent]

Google+ and Youtube have always been mentally separated.

I could like videos on Youtube without the risk of them appearing anywhere or being used for anything. This has changed. And frankly it sucks.