<https://secure.gravatar.com/avatar/f6da332b9a82fa2c0ca30c401355868d?s=96&amp;d=mm&amp;r=g>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://www.dotndot.com/digital-audio-marketing-and-advertising-statistics/>