It's just email, right? So what if someone gets your password. What can they do beyond spam friends, right? With access to your primary email account, hackers can often gain access to many parts of your personal life. Bank accounts, credit card accounts, order stuff from places like Amazon and other vendors which may have your card information stored. Two factor authentication helps ensure that even if someone intercepts your passwords, they can't get into your accounts without your cellphone (or at the very least you know when someone is trying to gain access). It's a minor inconvenience to occasionally have to 'reauthorize' your computer for an account – but it's worth the protection provided by it. Enable two-factor authentication on as many accounts as you can… Share with your friends!

Here's Everywhere You Should Enable Two-Factor Authentication Right Now
Two-factor authentication is one of the best things you can do to make sure your accounts don't get hacked. We've talked about it a bit before, but here's a list of all the popular services that offer it, and where you should go to turn it on right now.