> But social-media platforms don’t have to be organized around shareability. Instagram, for instance, doesn’t allow links, except a single one in each user’s profile. This dampens self-promotion and slows down the spread of information from the rest of the internet on the platform. It doesn’t have native reposting tools, either. And it is, by pretty much all accounts, a nicer place to spend time online.

While it may have that going for it, wasn't Instagram recently considered the worst social media app for mental health? https://www.cnn.com/2017/05/19/health/instagram-worst-social...

I'm not convinced that dampening self-promotion and discouraging reposting are sufficient conditions for considering one platform to be better than the other.