How the em dash went from punctuation to an AI-writing tell

Live_It_Fully · reddit · 2026-09-10

A Reddit post (with video) jokes about the em dash's fall from grace: once an ordinary punctuation mark, it's now widely read as a telltale sign of AI-generated text — so much so that human writers feel they need an alibi to use it.

The discussion touches on the folk culture of spotting AI writing and how model stylistic quirks have reshaped perceptions of everyday punctuation.

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