This document discusses location-based services and technologies like asynchronous location data collection, location tracking, networks, and GeoRSS that can record a user's locations and paths via GPS or web browsing to build complex networks. It provides a brief history of GeoRSS and lists some repositories where geotagged content can be found, including Geopress, Mapufacture, Geotagthings, Upcoming.org, Platial, Tagzania, and Flickr.