Chaney admitted he hacked into the personal emails of his targets by clicking on the "forgot password" feature of their accounts and answering security questions by using publicly available information about celebrities that he found on the internet.

BBC: Scarlett Johansson nude photo hacker pleads guilty

It joins other account-recovery features such as the ubiquitous "forgot my password" and security questions, as well as less conventional methods, like identifying friends' faces in pictures or recovering passwords via text message.

CNN: Mark Milian,

When someone who has enabled the feature is unable to login using the normal means, they can click "forgot my password" and request that keys be sent to their specified friends via Facebook message.

CNN: Mark Milian,

Let's see if anyone forgot to set a password on his or her copy.

CNN: Opinion: Difficult to become a hacker? It's easier than you think