I was here, you were thereJune 30, 2010
You leave data trails all over the place. Geotagging photographs is something I’ve done as part of my CCTV project (lacking a GPS unit, I find where I was on Google Earth). Using geotagged photographs from flickr this enterprising photo-georgrapher has produced these maps of where people have taken photos.
Here’s one of Manchester, but there’s lots of other cities here.