Posted 13 November 2012 - 03:51
At first I thought you were telling a heroic story about how you actually did this, then it turned sad, lol. You could potentially use this method with any website that she could automatically log into though, not just Facebook, or websites that support logging in with Facebook, like Neowin, since even though the user didn't actually sign in on Facebook.com, they authenticated with the Facebook servers.
Don't all modern Windows OSs "phone home" to ensure they are geunine when they are connected to the internet? So if she knew her Windows service tag, Microsoft could potentially tell you the IP that the computer checks in from. Then again, that adds a 3rd party to the mix, Microsoft, and not just the ISP, so you increase overhead and the time it would take to find the laptop.