I know very little about social media. My son knows a pretty fair amount. He has had a GMail address for 6 + years. He opened a Google+ account approx. 3 years ago but didn’t start using it until one year ago.
I just noticed that his YouTube subscriptions and videos he has commented on are available for anyone to see on his Google+ account, after clicking Profile and About.
He tells me he didn’t know these two things were linked like this, he thought a history of his YouTube selections (subscriptions/commented on videos) were only viewable to him.
Does it seem plausible to you that he could have been unaware of the connection?