itwbennett writes: "What's worse than Facebook saving your location data? Facebook saving inaccurate location data. One Facebook user was surprised to find that 'though she lives just north of Boston, Facebook was telling her that she was logged in from locations more than 400 miles away.' The culprit: Accessing Facebook from her iPhone. Facebook spokesperson Frederic Wolens told ITworld's Dan Tynan that the company 'infer[s] the information from carriers and the device IP, some IPs have users from all over a region of the country, in those cases we can't disambiguate where in the region they are and a central arbitrary location is displayed.' Which is all well and good, unless you're in the position of needing to prove you were in one location and not another."