[nicely off-ops, pre-X-mas 101] James Hess wrote: [..]
On the other hand, it's perhaps the best geolocators can _try_ to do...
And they really can't care less about that data. What they do is very simple, and it maybe explains for you why for instance the big G earns loads of money: by aggregating data and selling it. When you go to Amazon.com and you buy something, from your IP, you fill in your full address details. Then your DHCP expires or for some other reason your IP changes, and another person gets that same IP, they go to some other site and fill in their address details. Do this trick for a couple of hundred rounds. Most very likely the same /24 or some other size will be re-used in the same geolocation, may that be country, US state (which actually is just country size compared to Europe), city etc. After a while you will have a lot of people (they can't care less about your name though) who have said that when they came from IP a.b.c.d, that their address was X, as such for IP a.b.c.d you had x% people saying it was city Y and y% saying it was city Z. Presto, your accuracy for that IP. Even works when people fill in fake data or use business/home address (that is why they want you to tag it as such, as it would screw their stats :) Now combine a couple of thousands merchant site to increase the data you get, buy/sell it at country/state/city/street level and you have the best data ever. That 0.1% of the data that is 'inaccurate' now is the data of proxies and other multi-city/state/city IP addresses. Now you know how to earn money by selling something you collected from simple a site. Now you probably also understand why data from "Social Sites" is so valuable: all those people fill in all their data, and that in a structured way, together with a nice link to 'friends' who also do that, from which you can so statistical stuff about how accurate it is as most of them live togheter/closeby or talk about it. They don't really break any 'privacy' with that, they generally can't care less about who you are, they just care about the statistics, as that is the data they will sell. Can't help you any further though if you are still wondering how the two G man bought their own Boeings ;) Greets, Jeroen