I am a fan of Print-on-Demand, and have dabbled with everything from Lulu publishing to one-off books of Wikipedia compilations, Blog to Book variations, and collecting a bunch of PDF articles into a portable book.
I like a paper copy of a book, instead of simply a digital one.
Having said that, I just saw Facebook compilations which seem pretty high-priced to me. Do people really want coffee table books of their own FB interactions?
All the more reason to finish an autobiography I can sell for a tenner!