This article at bbc references the time as misguided.
This article shows that measuring attention spans is not that easy and our world is more distracting. Not a good think but it does not blame the people.
This Booktuber got some sources and a nice way of presenting it.
One might argue I am splitting hairs and I do not blame you if you think that. I hope some people think harder about their focus and how to find some calm moments. Yet I say that while searching up sources because I got a mobile notification.
What tiktok does is curate well. But I often find myself searching for new creators by what I already like. Tagging systems and smart groupings can help me customise my feed on my own but are really hard to do by hand. The problem with algos is that I get no say in what they hide and show. I would love my personal bias to be embedded by myself. The problem lies in who controls the algorithm and what their biases are.