Hate to break it to you, you're on social media right now.
My heuristic is that social media focuses on particular people, regardless of what they're talking about. In contrast, forums (like HN) focus on a particular topic, regardless of who's talking about it.
I was replying to a discussion between two HN users, who were using conflicting definitions of the term. AFAIK they are not "those in power".
AFAIK nobody here is. The point is that with relevance to the current discussion on potential future age-verification laws, only the widest definition matters, because that's what's at risk.