Jim Milliot writes: “Adult fiction has been publishing’s steadiest-selling category for the past 18 months. In the first six months of 2023, adult fiction was the only category to register an increase, with sales up 4.2%. The biggest driver of those gains, of course, has been books that have the backing of BookTok. But a new analysis by BookScan shows that BookTok’s effect on sales is diminishing. The most notable sign of that softening came in July, when, for the first time, sales from the roughly 180 BookTok authors BookScan follows fell compared to the prior year.”