More and more I see comments, unless explicitly asked for, as spam that I'd disable if I could.

Most of the energy in social networks these days goes into keeping the garbage out of replies. If originators had stronger tools, there would be less work for the platform to do, and overall happier people.

On Facebook, I often limit comments to friends, who don't tend to spam, presumably because we like to stay on good terms, and spam is an imposition, at best, and often insulting.