Go to Parameters > Configuration and then Social Networks. There, you can easily configure your social networks, integrate them onto your website and manage your Twitter timeline.
This is where you you'll need to fill in all the fields with the URL's of your social networks. Don't worry if you don't have a Snapchat or Instagram profile, you're not obliged to fill in all fields.
In this section, you can enter your Facebook ID which allows you to moderate comments should you chose to use Facebook comments. The App ID allows you to add to your Livefeed.
Get your Facebook App ID