Since you have to log in to Facebook to get the html for a share / like / recommend button, here is the code. More options are at https://developers.facebook.com/docs/plugins/like-button
Include the JavaScript SDK on your page once, ideally right after the opening tag.
<div id="fb-root"></div>
<script>(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_GB/all.js#xfbml=1";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>
Place the code for your plugin wherever you want the plugin to appear on your page.
<div class="fb-like" data-href="http://foo.bar" data-layout="button_count" data-action="recommend" data-show-faces="false" data-share="true"></div>
<iframe src="//www.facebook.com/plugins/like.php?href=http%3A%2F%2Ffoo.bar&width&layout=button_count&action=recommend&show_faces=false&share=true&height=21" scrolling="no" frameborder="0" style="border:none; overflow:hidden; height:21px;" allowTransparency="true"></iframe>
Include the same JS as above.
<div class="fb-share-button" data-href="http://foo.bar" data-type="button_count">
</div>
Share does not have an IFRAME or Link implementation.
👍