“We Were Liars” came out in 2014, so when the book’s author, E. Lockhart, saw that it was back on the best-seller list last summer, she was delighted. And confused.

“I had no idea what the hell was happening,” she said.

Lockhart’s children filled her in: It was because of TikTok.

An app known for serving up short videos on everything from dance moves to fashion tips, cooking tutorials and funny skits, TikTok is not an obvious destination for book buzz. But videos made mostly by women in their teens and 20s have come to dominate a growing niche under the hashtag #BookTok, where users recommend books, record time lapses of themselves reading, or sob openly into the camera after an emotionally crushing ending.

These videos are starting to sell a lot of books, and many of the creators are just as surprised as everyone else…

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