title: Can someone spoof an IP address to any number?
body: <p>An IP address helps Facebook and Google to determine whether someone trying to access your account is in fact you. I've seen proxies able to "spoof" the IP address, but that wouldn't change it to the correct one for access to that account. If someone knew my IP address and password to one of my accounts, would it be possible for someone to spoof their IP address to match mine? Is IP address security like this really safe and would it be good to incorporate it into my php scripts?</p>