In the fifth and final part of our series, Social Books, we explore how the “big six” book publishers use social media. So far in the series we’ve looked at the largest social network for book lovers (Goodreads), a new social network for book writers (Writer’s Bloq), how public libraries use social media, and whether book highlights are being successfully socialized. We’ve learned so far that almost everything to do with books - writing them, reading them, borrowing them, making highlights in them - has been impacted by Web technologies. So surely the biggest book publishers in America will have adapted to online technologies too, right? Let’s find out!