When your on YouTube you will often see comments such as "In this video Jeo talks about..." or "Check out this video if you want to know more about...". Every noticed what all of these have in common? They say "Via Google+" next to the name of the user that posted the comment! These "comments" aren't actually stating an opinion of the person that wrote them or are trying to interact with the author of the video, in 95% of all cases they merely summarize the contents of the video for some third-party that hasn't seen it yet. In short: They add no value when you just watched that video...