Facebook is useful for a few reasons: you don't have to remember birthdays, you can check sexual orientation and relationship status (sometimes), and you can stay in touch with people on an informal and largely stress-free level.
I do not care what the next movie in your Netflix queue is. I do not care what kind of zombie, ninja, or pirate you are. I am completely indifferent to virtual hatching eggs with enormous gerbils in them.
Your favorite movies hold enough information for me on your cinematic tastes. If you love the Red Sox that much, you can put them in your interests. You can even join an "I love the Red Sox" group.
What I don't need is pointless boxes I need to close in order to glean any kind of relevant information from your profile. What I don't need is massively increased load time just so I may have the privilege of minimizing these boxes.
Can't you keep track of your own bookshelf without duplicating it on the internet?