The reason I won't post a shelfie (a picture of my shelf with books I own) is that quite some of the books I own will cause aggressive discussions because I like to have controversial books in my collection. Just because I own these books that do deliver hateful messages doesn't mean I support them. Quite the opposite. But I want to know what "they" are reading. Mainly to make sure I can counter their "arguments". This does not go down well on social networks.