According to a story in TechCrunch today Google Mobile Maps PinPoints Your Location Without GPS:
"….Today, it updated its mobile maps
to pinpoint your locations by triangulating between cell towers (or if you have GPS on your phone, it uses that, but only 15 percent of phones sold this year even support GPS)."
I thought that's interesting - if you can locate people accurately - you can serve them content and advertising based on their location - but since not everyone has GPS, finding another way to do this would be needed.
Here's a video explaining how it all works:
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