Don't forget Facebook has it, too. I saw an attempt to crack my account just today, 2FA foiled their attempts. https://www.facebook.com/settings?tab=security
This makes me very happy. I just went in and turned it on for my account. Thanks for sharing!
Comments policy: Al is always right. Kidding, mostly. Be polite, and you're welcome to join in, even if it's a differing viewpoint.