<https://exnoweb.com/blog/seven-ways-to-audit-optimize-your-ppc-campaigns-to-boost-results/#primaryimage>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/ImageObject>
<https://exnoweb.com/blog/seven-ways-to-audit-optimize-your-ppc-campaigns-to-boost-results/>