I just got a pop-up box when I logged out of one of my accounts. Protect your password This is a public computer. To receive a one-time password to use instead of your Facebook password, text OTP to 32665. (Confirmed mobile number required.) That is just awesome. I use the same IP for some 70 accounts. Since there are 70 accounts using the same IP, they think they are using a public computer to access their accounts. My ignoring all the warnings to use proxies has paid off, those using proxies are running into roadblocks, meanwhile I never see them.