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Giving this another bump. This would be great to see in both subscription and classifieds/AdOwl. 

Found this while searching for the ability to add multiple locations to a map. I upvote on this. Could be used for so many things, such as adding garage sale locations to a map, locations for a crime spree, events, festivals. I do it manually using Google MyMaps currently, but the ability to create a map and add assets to it within blox would be so much easier. Maybe it could happen now that new mapping is on the way?