AUTOMATIC ENTITY GROUP CREATION IN ONE COMPUTER SYSTEM BASED ON ONLINE ACTIVITIES OF OTHER ENTITIES WITH RESPECT TO ANOTHER COMPUTER SYSTEM

Techniques for integrating an entity identification system and a content delivery system are provided. The entity identification system identifies multiple entities that have been identified, by multiple users, through the entity identification system. The entity identification system determines a stage for each identified entity, creates multiple entity groups (one for each different stage), and makes the entity groups available to the content delivery system. The content delivery system assigns each entity group to a different content delivery campaign. In response to receiving a content request from a client device, the content delivery system determines an identifier associated with the client device, where the identifier is in a particular entity group. Based on the identifier, a content delivery campaign that corresponds to the particular entity group is determined and a content item associated with the content delivery campaign is identified and transmitted over a network to the client device.