Let's say I watched a YouTube video which I found interesting.
I would like to upvote it, but I don't want everyone to know that I watched it.
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 liked the video "How to live with an incurable disease"
Best Answer
Likes are always private and anonymous.
That said, the channel owner always can see the country of origin for likes and dislikes on videos. That information is not available for likes and dislikes on comments though.
Google+ has no relation to YouTube anymore. And is dead.