[Ghexor]

I agree with you that a pos/neg divide is clearer and more straight forward to construct.

Reading your comment also evoked in me imaginations of political repression. Anger and fear are really important emotions signifying "this situation is not meeting my needs". Social Media can abuse these for profit probably precicely because they play this important role. In this light, a ban on recommending negative content seems really dangerous. Any content that expresses dissatisfaction with the political status quo is likely to contain some 'negative' (I suggest the term 'challenging') emotions.

So while 'addictiveness' is, like you say, really difficuly to measure - I prefer we try.