How does WikiAlerts monitor Wikipedia changes?

WikiAlerts subscribes to Wikipedia’s live edit feed for every page on a user’s watch list. The moment a watched page is edited, an email notification goes out with a diff view showing exactly what was added, removed, or changed and by which editor account. If the change is clear vandalism, a one-click revert button rolls the edit back through the same mechanism a Wikipedia editor would use. This works because Wikipedia exposes its edit stream as a public feed – the engineering challenge is in the scale (millions of edits a day across all watched pages worldwide), the diff rendering, the email throughput, and not flooding users with notifications for trivial changes like reference reformatting.