<https://techcrunch.com/2012/02/01/linked-ceo-jeff-weiner-says-ipo-didnt-really-change-anything/>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://techcrunch.com/2012/02/01/linked-ceo-jeff-weiner-says-ipo-didnt-really-change-anything/>