According to reports, some notifications that Facebook will send may be sensitive or involve a sensitive account while encryption will ensure no one can read the content of the messages without the key.

Users who wish to receive encrypted emails can upload a public key in the Contact Info section of the About page. Facebook will also display users' PGP fingerprint as part of the contact info, in case Facebook wants to send encrypted mail.

Facebook has also released a new feature called Security Check-up, that would be popping up into select users' News Feeds soon. The Check-up will pop up over the top of the site, prompting users to explore a couple options you have to increase your security.

From there, Facebook will walk users through password security options and show the computers logged into different Facebook services.