Alex Stamos, Yahoo's chief information security officer announced at the South by Southwest conference that Yahoo users would be able to send encrypted email by the end of this year. Encrypting your email is valuable because even if an encrypted email is intercepted on its way to your recipient, the snoop won't be able to read it.
Keep in mind that encrypted Yahoo emails won't make you completely anonymous. Stamos explained what parts of encrypted Yahoo email won't keep you anonymous:
Stamos acknowledged the new service won’t let users completely mask their digital communications. Even if the message is unreadable, data about the message — such as when it was sent, to whom and its subject line — remain readable. That’s so the message can be routed across the Internet.
While Yahoo shouldn't be coming out with its email encryption service until the end of this year, you can encrypt your Facebook messages right now. Check out this download to find out how to get this Facebook encryption app.