A real-time asynchronous event aggregation system, method, and network device are configured to capture real-time asynchronous events, and to pass them as input to one or more aggregation engines to determine a reputation for a target. The aggregation engine(s) may then send out notifications where a reputation category changes for a target, indicating that an action may be taken to inhibit spam messages from the target, highlight a display of content from the target, or the like. As such, the event-driven aggregation engines may be designed to capture real-time asynchronous events, such as reputation reports for a wide variety of activities, including, but not limited to spam and/or not-spam messages, determining a reputation on a posting of comments to a movie, a blog posting, a play list posting, or the like. In one embodiment, a reputation of the sender of the reputation event may also be determined.