<https://www.calnewport.com/blog/2013/10/03/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.calnewport.com/blog/2013/10/03/why-im-still-not-going-to-join-facebook-four-arguments-that-failed-to-convince-me/?replytocom=396643>