Using A Unique Apple ID for iCloud
When you first create an iCloud account, you’re encouraged to use your pre-existing Apple ID and username. This is to encourage Apple computer and device users to use the same Apple ID to make and track all of their iTunes Store, App Store, iBookstore and Newsstand purchases, plus use that same Apple ID to access Apple’s online-based iMessage instant messaging service, the FaceTime video conferencing service, and utilize all of iCloud’s functionality.
If you’re the only person who needs access to your iTunes Store, App Store, iBookstore and Newsstand purchases on your own computer(s) and devices, using the same Apple ID and password for this, as well as to access Apple’s other online-based services is practical and efficient.
However, if you want to share your iTunes Store, App Store, iBookstore and Newsstand purchases with other family members who have their own iPhone, iPad, iPod Touch, Mac or PC, but you do not want those other people to be able to access your iCloud-related files, use your personal iMessage or FaceTime account, or access your iCloud-related email address, create one shared Apple ID account for Apple-related online purchases, and then create a second, personal Apple ID account that you use with some of iCloud’s features, as well as iMessage and FaceTime.
To create and manage your Apple ID account(s), visit https://appleid.apple.com from any computer or Internet-enabled device. However, when you set up iCloud, or use iMessage, FaceTime or try to access the iTunes Store, iBookstore or Newsstand for the first time, you also have the option to create a new Apple ID account.