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 read December Park recently, and wanted to discuss it with someone, and realized it far too late and not a relevant enough of a book to host a discussion of it. So yeah kinda. Granted atleast I can give an answer when someone ask for recommendations or what books I didn’t like.