It's well known in the reading community that "reading" and "talking about the books you want to read" and "buying and owning books" are all very different things; I guess the missing piece would be "talking about the books you've bought and now own" which is sharing pictures of "shelfies" etc. I'm not really into the last one but the first three are all very enjoyable to me, in very different ways, although I only really enjoy buying physical copies of nonfiction books; for fiction I tend to just go for ebooks.