See the link below for more details, including data sharing (which Amazon won’t be doing)
Amazon’s new feature is the company’s small first step toward tapping into the world of social shopping.
When shoppers connect their Amazon and Facebook accounts, they see their Facebook profile photo on Amazon’s site. They also see which of their Facebook friends have upcoming birthdays, and receive gift suggestions based on the music, books and movies those friends have said they like on Facebook and on their Amazon wish lists. At the same time, they see recommendations on what to buy for themselves, based on what their friends like.