Not only that, but people have discovered that comments shown to you on YouTube videos are also subject to "algorithmic scoring", based on your preferences, just like video recommendations.

About a year ago a video went viral where someone in a romantic relationship demonstrated that the opinions expressed in comments on videos shown to her differ radically from the opinions expressed in comments on the exact same video when viewed by her significant other using his account.

My wife and I then immediately verified that this was true for us as well.