Okay.
I'll just go back to Amazon. I want to quickly get this out.
Under “How do I connect my Facebook account to Amazon?”, Amazon.com says:
From Settings, tap My Accounts, and then tap Connect your social networks.
Tap Connect Your Facebook Account.
Enter your log-in information, and then tap Connect.
That is a pretty simple way of connecting your Facebook account with your Amazon account, so I'll just ask again: If you do that, what type of data are you sharing between the two platforms?