How to let Vanilla know that Facebook account has already logged in?

edited April 2011 in Vanilla 2.0 - 2.8
I add Vanilla into my Facebook app and accept it from my FB account. But after logging in FB next time, I have to click on "F" button to let Vanilla know that I logged in Vanilla from FB.
Is there a way to void this?
I mean when I go to my app in FB, Vanilla automatically knows that I've already logged in (and so does with log-out). This is a kind of auto synchronizing between FB and Vanilla.
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