I can't see my twitter or Facebook. What do you mean you were not signed in on the Facebook settings area?i just noticed mine is now missing also.
i wonder if this is related to my recent deactivation and reactivation of the facebook account.
did you recently do that also?
-edit
I was not signed in on the facebook settings area. now mine shows.
follow these steps:
Seetings - > Notification -> Share Widget -> Enable