Cliff Stoll, the author of 'The Cuckoo's Egg', discovered that an AI-generated review on Facebook falsely announced his death. He found that the review was part of a larger trend of AI-generated content spreading misinformation on social media. Stoll notes that this experience has led him to be more cautious about the information he consumes online. The incident has also sparked a discussion about the reliability of AI-generated content and its potential consequences.