After Facebook, Google, Microsoft and PayPal, Apple has started offering two-factor authentication to help its customers secure their Apple IDs against hacking. Initially, two-step verification is being offered in the U.S., UK, Australia, Ireland, and New Zealand. Additional countries will be added over time, per Apple’s support website. The new feature is designed to block unauthorized changes to the iCloud or iTunes accounts, and keep hackers who steal Apple IDs from purchasing digital context or hardware using the credit cards stored in...