query: select ?item (CONCAT("[https://www.facebook.com/",?facebook,"/about?section=contact-info&pnref=about]") AS ?facebooklink) {
    ?item wdt:P31 wd:Q5 ; wdt:P2013 ?facebook
    optional {?item wdt:P21 ?gender}
    filter (!bound(?gender))
  } order by ?item