Ehh… Application of a addiction model is somewhat controversial for pornography (the ground seems divided on whether it’s a compulsion or an addiction). Social media, however, is no less controversial (it’s just the media likes to hype this more).

I will say - the point of a porn site is to sell user data and deliver ads, whereas the point of social media is to keep the user scrolling by any means possible. By its design, the latter cultivates addiction as a clear goal (the goal to scroll is artificially imposed), whereas the case for the former is less clear (the goal to masturbate isn’t something porn created). In essence, one creates a drive and then sates it, whereas another sates an existing drive.

Honestly, I think, at the moment, we’re on the “violent video games cause violence” stage of the research. In other words, not enough data to decide so the media has decided for us.