You don’t need to know which web browser I support, or what blog-network I’m a part of. You don’t need me to point you to a social-bookmarking site, because chances are, you know them already. And if not, Google is always right there. You don’t need know what song I just listened to, because hopefully you have your own soundtrack. And I don’t think knowing what book I last read is of any real use to you unless I write a lengthy review and tell you what I thought of it.