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var object = {
   "141584815857827": {
      "id": "141584815857827",
      "name": "Test Account",
      "picture": "http://profile.ak.fbcdn.net/hprofile-ak-snc4/hs622.ash1/27522_141584815857827_7750_s.jpg",
      "link": "http://www.neustep.com/showcase.php?wwid=7083",
      "category": "Company",
      "fan_count": 3
   }
}

for (key in object) {
  var obj = object[key];
  var id = obj.id;
  // User obj/ id here. If there is more than one id the loop will happen more than once.
}