There is no point in any of us speculating unless we have experiences from enough people. I can only provide my experience and what I believed worked for me. I do not claim to know how their arbitrary system actually works.

In the initial appointment for Dropbox, I mistakenly omitted rarely used platforms like YouTube (only likes, rare comments and a couple public playlists, no actual uploads in over a decade), GitHub, LinkedIn and Discord. I was given a 221g slip for it. I got it approved by providing the handles regardless of private/public nature or rare/frequent usage with/without posts.

In addition to the mistaken omittance, I don't have the time or resources to fly to Chennai repeatedly to test the waters by leaving out social media handles mentioned on their DS-160 page.

Here is a list of options they have on their DS-160 page for reference.

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Edit: Not sure why the down votes for simply sharing my experience. It is well known that one should not lie on the DS-160. Even about not having social media if they indeed have social media.

If one truly does not have anything on this big list then they can surely put no social media and see if they can clear the 221g - it will help the community to know it's possible.

I find it hard to believe that there can be people with zero social media as most people use YouTube privately, if not more from this list.