Facebook Connect grants your site access to more of Facebook's 'product'. Regardless, in my opinion An SSO/Identity Service seems like a reasonable API to charg

Facebook Connect grants your site access to more of Facebook's 'product'. Regardless, in my opinion An SSO/Identity Service seems like a reasonable API to charge for. Developers won't go elsewhere until the products, err users go elsewhere first. Facebook's value is always going to be about data and who has access to it.