query: SELECT DISTINCT ?item ?itemLabel 
  WHERE {
  {?item wdt:P31 wd:Q4830453}
  UNION
  {?item wdt:P31 wd:Q571}  
  UNION  
  {?item wdt:P553 ?website} 
  UNION 
  {?item wdt:P2013 ?facebook}
  UNION
  {?item wdt:P2002 ?twitter}
  UNION
  {?item wdt:P2003 ?instagram}  
  FILTER NOT EXISTS {?b schema:about ?item}
  FILTER NOT EXISTS {?b schema:about ?a. ?a ?prop ?item}
  FILTER NOT EXISTS {?item wdt:P2611 ?tedtalkid}
  FILTER NOT EXISTS {?item wdt:P214 ?VIAF}
  FILTER NOT EXISTS {?item wdt:P1800 ?wikidatabaseid}  
  SERVICE wikibase:label {
   bd:serviceParam wikibase:language "en" .
  }  
  } LIMIT 8000