Chrome extension replaces YouTube comments with Facebook comments
Because Facebook comments (or the absence of Facebook comments) are, in general, preferable to YouTube comments.
Sure, you can Facebook YouTube Comment extension, you can replace YouTube comments with those made about the video on Facebook., but with the
The extension adds a Facebook comment section below the video player on YouTube. You can still get to YouTube comments on a video. The extension simply collapses them; they're still there and just a click away if you're interested. A quick scan revealed that most videos do not have Facebook comments, but I found a few that did, and they had a decidedly international flavor.
If you are logged into Facebook, you can comment on a YouTube video with this extension right from the YouTube page, and there is a check box to share your comment on Facebook.