removeallfacebookads.user.js

// ==UserScript==
// @name           Remove All Facebook Ads
// @author         http://joshdick.net/programs
// @version        1.4
// @namespace      http://userscripts.org/scripts/show/13787
// @description    Removes any and all ads from Facebook.
// @include        *facebook.com*
// ==/UserScript==


var sidebar_removed = false;
function Remove_Sidebar_Ads() {
  if (sidebar_removed) return;

  var sidebar_ads = document.getElementById('sidebar_ads');
  if (sidebar_ads && sidebar_ads.style.visibility != 'hidden') { //Prevents the visibility from being set multiple times unnecessarily
    sidebar_ads.style.visibility = 'hidden';
    sidebar_removed = true;
  }
}
Remove_Sidebar_Ads();

function Remove_Dynamic_Ads() {
  var elements = document.evaluate(
    "//div[contains(@class, 'ad_capsule')] | //div[contains(@class, 'social_ad')] | //div[contains(@class, 'sponsor')] | //div[contains(@id, 'sponsor')]",
    document,
    null,
    XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE,
    null
  );

  for (var i = 0; i < elements.snapshotLength; i++) {
    var thisElement = elements.snapshotItem(i);
    //GM_log("Removing Facebook ad element with class='" + thisElement.className + "' and id='" + thisElement.id + "'.");
    thisElement.parentNode.removeChild(thisElement);
  }
}

document.addEventListener("DOMNodeInserted", Remove_Dynamic_Ads, true);