var url_list = [

  "https://www.facebook.com/impression.php/f2e61d9df/?lid=115",

  "https://www.facebook.com/plugins/like.php?app_id=5",

  "https://www.facebook.com/tr/?id=228037074239568",

  "https://www.facebook.com/tr/?ev=ViewContent",

  "http://www.marvel.com/abc?f=33",

  "http://www.marvel.com/games?a=11",

  "http://www.marvel.com/games?z=22",

  "http://www.marvel.com/videos"

];

​

var urlListextended=url_list.map(el=>el.split("://")[1].split("/"));

var result={};

for(var index in urlListextended){

    var el=urlListextended[index];

   result[el[0]]=result[el[0]]||{};

    result[el[0]][el[1]]=result[el[0]][el[1]]||[];

    result[el[0]][el[1]].push(url_list[index]);

 }