Register gate with protected content? How do I do it?

I want to have protected content on posts and some pages. To reveal content, I want visitors to register as a user with facebook or wordpress as options.

How do I do this? I see your facebook plugin, but it only works as a widget. I would want to embed it in a post.

I also see your social gate plugin, and am trying your pay per view plugin, but neither quite works. The pay per view would be good if I could turn off the payment part.

Suggestions? There must be a way with all your fancy plugins!

Thanks!,
Amy