If it’s not a famous book, you may find some Goodreads reviews and if you’re lucky a Reddit post or two, but not vasts amount of online discussion like you’ll find about any passingly good series or movie.
And if you love a movie or a tv show, it is much easier to convince people in real life to also watch it, since it’s way less time consuming and not everyone even reads books, but most people watch movies.
I just think that this really sucks about reading books.
I just finished “What Moves the Dead” and am currently reading “Dune”, chewing my way steadily through “The Brothers Karamasov” and have my sights set on “Mexican Gothic”. I like fiction, fantasy, sci-fi, historical fiction, the occasional autobiography, horror, and the classics.