O'Reilly NOOK Manual page 382

If you tap "Invite a friend via email," a screen appears that lets you type in
the first name, last name, and email address of someone you want to invite
to be your NOOK Friend. Fill in the form, tap Save, and the invitation goes
on its merry way.
NOTE
If you have already imported contacts from Google into your NOOK's Contacts app, the "Find
friends from Google," listing will not appear. You'll receive a notification asking if you want to invite
any to become NOOK Friends. Tap the notification, and then tap the name of the person you want to
invite to be a friend, and follow the directions for sending an invitation.
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