You are correct that ArcGIS.com doesn't really support the workflow you describe. There is only one map author and only he/she can edit the map.Here's an idea you could try...The different people in your group could create their own version of the map by doing a "Save as" then sharing the new version back with the group. As long as people created versions sequentially, all the edits could end up in one map. Not the ideal solution, but it could achieve your end goal.Thanks,Mike
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