<https://www.onlinesolutionsgroup.de/blog/clubhouse-wie-relevant-ist-die-app-fuer-ihr-maketing/#article>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.onlinesolutionsgroup.de/blog/clubhouse-wie-relevant-ist-die-app-fuer-ihr-maketing/>