query: #What websites do humans have "website usernames" on?
  #title:What websites do humans have usernames on
  #illustrates bubblechart view, count
  
  #defaultView:BubbleChart
  SELECT ?webSiteLabel (COUNT(?human) AS ?count)
  WHERE
  {
    ?human wdt:P31 wd:Q5.
    ?human wdt:P553 ?webSite.
    SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }
  GROUP BY ?webSiteLabel
  
  ORDER BY DESC(?count)