NEWS: Facebook's Guy Rosen just confirmed that the breach would have allowed hackers to access not only your Facebook account, but your accounts on other sites where you used Facebook as your login.
Also—separate from the question of third-party apps—Facebook says users affected by the breach who have Instagram or Oculus accounts linked to their Facebook account will have to un-link and re-link them.
For those asking: Rosen confirmed this to me on a conference call with reporters just now.
Hat tip to @Chronotope for asking the question on Twitter, which prompted me to ask it on the call.
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