Facebook is basically a tool you can use to interact with your viewers more. Even if you don't have many viewers, add a link to your FB page on each YT video and in your social badges within your YT page. It will probably take you a while to get likes on your FB page but keep working on it, letting people know what you're up to, sharing tips or links to things you know or like. Interact with those who like your page and let viewers know when to expect a video.
Keep it exciting but not spammy.... maybe strike curiosity for your viewers saying stuff about how fun your vid was to make and that you will let them know you will post a link soon.
That's how I see FB anyway....