"Hi Joshua, Thanks for the thoughtful comment. I do think that PayPal is generally low-friction at the time of purchase. All you need to do is to type in your email address, password, and off you go. I use PayPal for my conference business and can agree that the post-purchase experience is not the greatest and that fraud can be an issue. PayPal has lots of people working on keeping that service safe and usable. Facebook has lots of people working on payments, too, but I'm not sure that they'll have the resources or focus to make a great user experience and manage the back and fraud / chargebacks that will inevitably arise. A simple 1-click experience for users is a proven value proposition - I'd like to see what Facebook ends up implementing." - Charles Hudson