Prophecy approved companion is excellent! It gave me all the feels. It’s both extremely funny, and extremely poignant as the main character learns who she is, what’s really going on, and her intended roll in it all. It’s one of the few series where the reader knows exactly what’s happening from the start, but the fact the main character being slow to catch on isn’t frustrating.
The problem is that most data about books (ISBNs, DDC and LOC classification, cover images, synopsis, etc) are owned by either Amazon or Worldcat. So if you read anything even slightly off beat, you’ll be entering all of that data yourself. That also means recommendations aren’t really a thing. If you just want to track and share your reading, and don’t mind entering all the data yourself, bookwyrm is fine. But if you want to just search for a book and add it to your shelf, or get recommendations of new books, it’s nowhere near there.