Screencap from linked article: In 2003, Google launched Google Alerts, a change-detection service that emailed users when new web results matched their search terms. The web was smaller and more manageable then, of course, so this became a part of many information workers’ toolsets. (That service still exists in some form, but is no longer the way most web users go about aquiring new information.) Information-gathering agents are an evolution of Google Alerts. Beyond spotting changes, they can make sense of them, too.
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