Let's say I watched a YouTube video and notice a comment which I find interesting.
I would like to upvote the comment, but I don't want everyone to know that I watched this video.
Is there any way for anyone outside YouTube to know that I had an of interaction with this video?
For instance, could the news below pop up into someone's Google+/something feed?
Your friend Robert has upvoted a comment on "How to live with an incurable disease"
Unlike this different question, this is about the comments.