<http://schema.org/keywords>
"facebook, thinkapple.sk, FBI, zuckerberg, mark zuckerberg"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.thinkapple.sk/2016/04/13/pozrite-si-novinky-ktore-nas-onedlho-na-facebooku-cakaju/>