It's high time to add 2FA to your online accounts

Jefferson Graham shows how to change your security settings on Facebook, Twitter, Google and Microsoft for two-factor authentication, which security experts say is your best, quick defense against a hack. LOS ANGELES -- Maybe your Yahoo account got hacked. Or your preferred presidential candidate didn't get elected, in part due to damaging information revealed by a hack of an official's Gmail account. How about that McDonald's Twitter hack this week--now, do we have your attention? No story generated bigger tech headlines this week than news related to what's thought to be the largest hack on the books: The Yahoo hacks.