Since a few weeks Google includes user generated content in Google Maps search results. Basically it’s a good idea and useful data because some places or place-names aren’t collected by commercial mapping companies, who provide services like Google Maps with data. Jesuitenwiese at Prater for instance, a nice picnic spot in Vienna, now shows up in Google Maps search results because it got mapped by a random user on some site on the internet.
However, I’m not quite sure of how many people are really aware of that marked spots in their Google “My Maps” are available to a broader public audience through Google’s search functionality.
A search for picnic in Vienna for example links to the wedding route of a Google user (identified by a real name), or a picnic a woman (again, a real name is showing up) went to last Sunday.
To make sure private things remain private, well, at least not shown as Google search result, the flag “unlisted” in Google “My Maps” has to be set. Regarding KML or GeoRSS you can tell Googlebot how to handle the content by editing either robots.txt or sitemap.xml.
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