If you are not sharing a computer with others, the simple version of the Address Book cannot be viewed by others as it is hosted in your computer. All the details can be accessed only by 123greetings.com and no other website.
Note: If you are using a shared computer, it is advisable not to activate your Address Book (Simple version) because the Address Book can be viewed by the next user who uses the same computer.
On the other hand, the advanced version of the Address Book cannot be viewed by others as it is stored securely in our servers. To access your Address Book you need to login with your registered email address and password.