Facebook Autopoke

autopoke.user.js

// ==UserScript==
// @name	Facebook Autopoke
// @icon	http://i.imgur.com/5ShnMqG.png
// @namespace	http://www.softcreatr.de
// @author	Sascha Greuel
// @description	Automatically pokes back people.
// @version	1.9.0
// @run-at	document-end
// @grant	none
//
// @require	https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js
// @include	/^https?://(.*)?facebook\.com(.*)?/
// @exclude	/^https?://(.*)?pixel.\facebook\.com(.*)?/
// @exclude	/^https?://(.*)?developers.\facebook\.com(.*)?/
// @exclude	/^https?://(.*)?facebook\.com/ajax/(.*)?/
// @exclude	/^https?://(.*)?facebook\.com/chat/(.*)?/
// @exclude	/^https?://(.*)?facebook\.com/pull(.*)?/
// @exclude	/^https?://(.*)?facebook\.com/ai\.php(.*)?/
// @exclude	/^https?://(.*)?facebook\.com/xti\.php(.*)?/
// @exclude	/^https?://(.*)?facebook\.com/l\.php(.*)?/
// @exclude	/^https?://(.*)?facebook\.com/plugins/(.*)?/
// @exclude	/^https?://(.*)?facebook\.com/(.*)/inline/?/
// @exclude	/^https?://(.*)?static\.ak\.facebook\.com(.*)?/
// ==/UserScript==

(function ($) {
	function autopoke() {
		// 1st, we call the pokes page and fetch all pokes, if there are any
		$.ajax({
			url: '/pokes',
			dataType: 'html',
			success: function (data) {
				// Iterate through received pokes
				$("a[href^='/pokes/inline/'], a[ajaxify^='/pokes/inline/']", data).each(function() {
					if (window.location.host.toLowerCase().match(/m\.facebook\.com/)) {
						var $that = $(this).attr('href');
					}
					else {
						var $that = $(this).attr('ajaxify');
					}

					if ($that.indexOf('suggestion_type') == -1 && $that.indexOf('dom_id_hide') == -1) {
						// Poke found. Send poke back
						$.get($that);
					}
				});
			}
		});
	}

	// Runonce
	setTimeout(function () {
		autopoke();
	}, 1500);

	// Start timer
	setInterval(function () {
		autopoke();
	}, 30000); // Repeat every 30 seconds
}(jQuery.noConflict(true)));

Just added some further excludes to avoid multiple instances of that script may cause a browser crash.