gistfile1.js

// @namespace		http://qoln.org/
// @include		http://*facebook.com*
// @creator		Miles Meloro [milemeloro@yahoo.com], rewritten by anon
// @version		0.11
// @date		2012-04-29
// ==/UserScript==

var inputButton = document.createElement('button');
inputButton.textContent = 'Love It';
inputButton.addEventListener( 'click', function () {
	document.body.innerHTML =
		document.body.innerHTML.replace(/([lL])ike/g, '$1ove');
});

document.getElementById('jewelContainer').appendChild(inputButton);