Ok so you sign in once on facebook, then visit any of the 100 early adopters and you never sign in again; they all know who you are, who your friends are, what you read online.
TIPS:
- With "Wall Permissions," you can edit your settings for each specific application and site you have connected with including whether you want that site to always publish stories, ask you before publishing stories, or never publish stories for you.
- You can opt-out of being found on other sites by selecting "Don't allow friends to view my memberships on other websites through Facebook Connect"
- More: Facebook | Facebook Connect