This tutorial tackles on how to embed facebook videos to your page. To make the embed work, you dont have to create a Facebook Developer App ID. You just need to include the javascript SDK for Facebook Social Plugins.
This tutorial tackles on how to integrate facebook comments plugin. Today, almost every person on the internet has a facebook account. If you want to have a comment section on your website, you can integrate this plugin. This way, visitors won't be bothered registering and logging in to your site for them to comment.