I think it could be neat to read a chapter or two, and when I update my reading progress, I can have the option to write in my thoughts on what I just read for both myself to see and people who follow me. Kinda like a “status update” for what I just read. Maybe make this an available feature with an on/off toggle so you can use it if you want to, or an available entry box you can either fill in or leave blank when updating your reading progress.