Apple has rolled out two-step verification to the company's iMessage and FaceTime. That allows you to combine your password with a token to help protect your accounts from unauthorized access. That way, even if someone finds or figures out your password, they still won't be able to get into your account without the second step.
Apple originally enabled two-step verification for iCloud accounts back in March of 2013, but the the feature was restricted to making account changes and signing in on new devices. No, FaceTime and iMessage will benefit directly from the additional security.