Why do I need to authorize 123Greetings while importing photos from Facebook?

Since you are permitting 123Greetings.com to import photos from 3rd party sites like Facebook, 123Greetings.com need to get the authorization from them to get access to your personal photos. If you do not authorize, then 123Greetings.com won’t get access to your personal photos in external sites and hence you won't be able to send Photo cards.