Facebook Experiments in Postcards
According to Sanchez, "The few users who are in the feature’s tester group will see a “Mail Postcard” button at the bottom of photos they’re viewing. Clicking it opens a screen to enter the friend’s address and message. Users can ask their friend or check their profile for their mailing address if they don’t know it. For now you can only mail your own private photos to friends, or mail friends their own photos that you can see. It doesn’t work for public photos or photos from Pages."
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