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Most people can’t tell when a personal text message is written by AI. Here’s why it matters

Fast Company Tech The Conversation April 25, 2026
Most people can’t tell when a personal text message is written by AI. Here’s why it matters
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# When AI Writes Your Messages, People Can't Tell—And That's a Problem People can't detect when a personal text or email is written by AI, even though they form just as positive impressions as if a real person wrote it. However, the moment someone *knows* a message came from AI, they judge the sender harshly—seeing them as lazy and insincere rather than thoughtful and genuine. This gap between reality and perception matters because it means AI-written apologies, thank-yous, and other personal messages could fool people into liking you more, which raises questions about honesty in how we communicate.

Two new experiments show that most people do not even consider that a personal message could be AI-generated, even when they themselves use artificial intelligence to write. To see how people judge someone based on their writing in the age of ChatGPT, my colleague Jiaqi Zhu and I recruited more t

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