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Why doesn't a map service display in the ArcGIS.com map viewer?
The ArcGIS.com map viewer makes dynamic requests to a service. If a service has cached tiles, those tiles will not be used to display the map. In addition, if a cached service does not contain underlying data, but instead uses a "placeholder" feature class, the service may not appear at all.
This issue can be resolved by creating a dynamic version of the map service that includes all the original data.