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If you'd like to share it with us so you can take advantage of Facebook Login, you can update your Facebook permissions to give us access to your email. If not, you can always sign up for a Groupon account without using Facebook.
The Samsung S-View Flip Cover Clear enables you to see and interact with your phone screen through the front of the case. Respond to incoming phone calls, alarms and events while the cover is closed. Samsung S-View Flip Cover Clear for Samsung Galaxy Note8 - Black