Check this out :
Like Button code generator - LikeBtn[
^]
For example:
<!DOCTYPE html>
<html>
<head>
<title>Demo</title>
</head>
<body>
<h1>Do you like me?</h1>
<span class="likebtn-wrapper" data-identifier="item_1"></span>
<script>(function(d,e,s){if(d.getElementById("likebtn_wjs"))return;a=d.createElement(e);m=d.getElementsByTagName(e)[0];a.async=1;a.id="likebtn_wjs";a.src=s;m.parentNode.insertBefore(a, m)})(document,"script","//w.likebtn.com/js/w/widget.js");</script>
<p>Say again?</p>
</body>
</html>