app/views/shared/_facebook_like.html.erb
<div class="fb-like"
data-href="<%= url %>"
data-layout="button"
data-action="like"
data-show-faces="false"
data-share="false"></div>
<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_US/sdk.js#xfbml=1&appId=110875732309862&version=v2.0";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));</script>