Editor Notes: Timeline notes: Reports indicate that the unauthorized AI persuasion experiment on Reddit's r/ChangeMyView subreddit was conducted over approximately four months. Although exact start and end dates have not been confirmed, evidence suggests that the activity likely took place between late 2024 and early 2025, concluding shortly before the moderators publicly disclosed the experiment in late April 2025. The researchers reportedly made approximately 1,783 AI-generated comments during this period. The duration and scale of the operation are included here to provide additional context but remain based on external reporting and moderator disclosures.