It's possible to show georss feeds with the plugin (only google kml renderer). Just use the url to the georss feed as a kml file.

If the feed changes the map will also change. Keep in mind the google cache so it may take several hours to see the change.

For example:

{mosmap kml='http://www.flickr.com/services/feeds/geo/NL/?format=rs'}

Another example is on the website: http://chemtrailsmap.com

{mosmap kml='http://www.flickr.com/services/feeds/geo/NL/?format=kml'}