Perhaps there could be an unintended consequence that people will need to put some more effort into "sharing news" (i.e. writing or copying some words in order to begin a discussion)?

By having multiple origin sources for the story (rather than one widely shared post from an outlet) it might reduce the popularity bias of "everyone else liked that, I should too"?

Changing user behaviour is hard, but part of me wonders if this could be a really interesting experiment to see if it brings about any meaningful change on social media.