FB script 2015!! for non blocking javascript !

Is putting script at the bottom of the page enough for non blocking Javascript?

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I'm wondering if putting the script tag to load Facebook sdk js is good enough or should I leverage async script that Facebook provides

For example this is how I load Facebook sdk js right now in WordPress .

<?php wp_enqueue_script( 'facebook-api', '//connect.facebook.net/en_US/sdk.js#xfbml=1&appId=' . $app_id . '&version=v2.0' ); ?>
It results in putting the <script> tag at the bottom of the page. Or do I have to do this which is suggested by Facebook? I wonder what the difference is in terms of performance?
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the script on mediafire :
http://bit.ly/1CHA5kY