I’m not sure how much it makes sense to pick this nit for a public opinion survey of this nature. The survey is being sent to people who mostly won’t think of the term in such precise ways, and even in social sciences it’s considered poor form to try to measure more precisely than your noise floor permits.

That said, I would assume most respondents have a more popular conception of the term. That’s going to be inherently a little fuzzy, but implies implies sites like X, Facebook and TikTok count, that Reddit is marginal, and that more “oldschool” things like webforums, chat services and even Hacker News are out.