1. Memory holding instructions executable by a logic subsystem to: receive a share command indicating a digital content item that is recognized by a digital content management service and that is to be recommended; receive an indication of an intended recipient of the digital content item; determine if the intended recipient belongs to the digital content management service; and if the intended recipient belongs to the digital content management service: build an in-service content-recommendation message for the digital content item; and send the in-service content-recommendation message to the intended recipient; or if the intended recipient does not belong to the digital content management service: build an out-of-service content-recommendation message for the digital content item; and send the out-of-service content-recommendation message to the intended recipient.