I've been searching the past two hours on how to do this, and nothing is coming up. Can anyone give me a step-by-step? Thanks.
I'm having the same problem! The button half pops up to link with it but does nothing :(
Twitter worked without any problems though.
Where the button was though if you didn't find it is when you add your accounts to your profile.
and ta da the facebook button is there. Don't know if that helps mind you.