In September, YouTube announced that it would soon roll out a new commenting system powered by Google+. After testing it on channel discussion tabs for a few weeks, it’s now starting to roll it out to all videos on the site.

Given the size of YouTube, this roll-out will start this week, but it will take some time before it is fully effective. Until then, you may see both systems on the site, depending on which video you are watching.

It’s no secret that YouTube comments aren’t exactly a hotbed for smart conversations, so the company hopes that this change will increase the quality of comments by putting the emphasis on conversations and not on one-off comments. The idea here, YouTube says, is to ensure that “YouTube comments will become conversations that matter to you.”

Instead of organizing comments by chronology, YouTube will now rank them by relevancy, taking…

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