On a private beta I'm currently on, I see the notice below an unanswered question:
Know someone who can answer? Share a link to this question via email, Google+, Twitter, or Facebook
That suggestion should not be there, because only members can see questions.
(Note that this is different from Sharing Links On Non-Public Beta Sites. The "normal" share-link is not available on private betas, but the Know someone? one still is)