Anyone starting to use two-factor authentication? Two factor authentication is when, in order to authenticate an account, you not only enter in a password but also a code from a device that you hold such as your smartphone. I know that it was previously was used by some financial institutions where you had a keychain FOB to authenticate access, and it has also been used by some online MMORPG such as Battle.net (for World of Warcraft and Starcraft) and Star Wars: The Old Republic. A few months ago, the Google Authenticator application was introduced as well, and I have locked down both my LastPass account as well as my Google Accounts. Yahoo, however, implements a SMS message that gets sent to your cell phone as part of the log in process. Thoughts on this? Will Google Authenticator be implemented as a security feature now with web forum software such as vBulletin?