Why should I care what those people are reading or think. I'm not them and they're not me and while some of my interests may overlap with them, it doesn't mean I want to, or will enjoy, reading what they read.
...okay? With the exception of tailored algorithms, i.e. Pandora, every media service or list is going to be the opinions of one or more persons.
What's on cable is relegated by Neilson ratings, what's on the radio is relegated by what's popular / the DJ's favorite songs, what's in a bookstore is relegated by what sells well (or, by what doesn't sell poorly). Everything is curated.
Why should you care about the bestseller lists? This is an alternative if you want to get some insight into the thought process of these (terrible) people.
Also these three people are examples; the point is that some public people that you may care about recommend books, and that is a way to discover books.
I only said it because I meant it. Booklists from people one admires (or detests) are a good place to check to discover new books, though.
I also suggest bibliographies and references in things that you are currently reading. That's usually where I find the next things to read. Especially with journal articles, because you can find other things that cite a paper you enjoyed pretty easily on the web.
What's on cable is relegated by Neilson ratings, what's on the radio is relegated by what's popular / the DJ's favorite songs, what's in a bookstore is relegated by what sells well (or, by what doesn't sell poorly). Everything is curated.