People who like reading e-books now seem to be more like some social networking sites and places with book reviews. Look at other people's comments below and add friends. This is a way to find book friends. There is also WeChat reading. Send a QR code for reading on WeChat in a circle of friends. People will scan you and meet some book friends. If it is a paper book, you can go to a bookstore, or a coffee shop, or a bookstore is better. If you wander around an area, you can meet many like-minded book lovers who like to read the same kind of books.