<https://www.getresponse.pl/blog/fan-advocacy-czyli-niewazne-ilu-masz-fanow-wazne-co-potrafisz-z-nimi-zrobic>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.getresponse.pl/blog/fan-advocacy-czyli-niewazne-ilu-masz-fanow-wazne-co-potrafisz-z-nimi-zrobic>