Dominik,
I'm not sure what you mean. The autologin feature works for any users that have already registered on your site through their Facebook account. So, it's always for registered users only. If you meant only for logged in users, the user isn't actually logged in when it auto-logs them back in.. that's the purpose. Even though it doesn't seem like the user ever logs out, they actually are, but on the next page load, we're re-logging them in. Again, that's a bug from Facebook, and something they have set to "High" priority.. and we're hoping it's fixed soon.
If you were looking for something else, just let us know.
Thanks,
Alex