In the midst of the privacy concerns and backlash over Facebook’s Beacon service, I thought of a great idea for a Facebook application: the Amazon “Share the Love” friend referral program. (Amazon created the Share the Love program in 2002. Whenever you placed an order, Amazon offered to email your friends with a discount offer of 10% for the same items you just bought. If any of your friends used the discount, your account would also be credited with that same amount for a future purchase. You had full control over whom would receive the emails, and which products would…