I really like librarything, but the app doesn't have all the features the website has. In general it's great for cataloging your own books and crowdsourcing information but doesn't have the community aspect, although the website does have message boards.

I tried storygraph briefly, but didn't keep up with it. It felt like a chore to me at the time.

I'm intrigued by BookWyrm though, and am interested to see what others say about it. Haven't tried it yet but definitely considering it.