I'm wondering why they don't offer users the option of using two-factor security, like Google recently made available to Gmail/Google App users. Being able to t

I'm wondering why they don't offer users the option of using two-factor security, like Google recently made available to Gmail/Google App users. Being able to tie my gmail login to a secure passcode generated on my phone makes me feel a good deal safe, and I don't even have any really important information in my Gmail inbox.