If you always want to know about what everyone else is reading then here are a couple of websites you're sure to enjoy:
Underground New York Public Library
Whenver I see someone reading in public I can't resist trying to casually get a look at the book's cover to see what they are reading. Apparently I'm not the only one who does this because there is a whole Tumbr site dedicated to pictures of people reading in the New York subway. It's facinating...