I agree on your first point, however I find your second comment an issue, with Facebook your friends personal details are already entered. With Paypal, you send money to people who already have an account, Well that is my understanding of this. But again the data is already inputted. Since this is such a new website building up a user base from sign up would require you to invite all your friends to register so they have the details neeed in the system to send such a gift. Correct me if I am wrong.