Here is an example of socialising a YouTube video with Facebook’s social plugins. In this example, I’ve integrated a simple video with the Facebook Like and Comment plugins. For styling, I’ve used the Twitter Bootstrap CSS Framework.
The major components on this page (youtube video, facebook plugins) are easy to integrate from elsewhere – for example, you can copy the embed code from YouTube by right-clicking on a video and selection “Copy Embed Code”. Facebook lets you use a code builder to customize the Like and Comment plugins, which you can then copy-and-paste too.
Only the styling and structural components on this page required hand-coding. Try changing the YouTube video, or the location of the Like / Comments to see just how easy it is to modify the code.