As the founder and director of a nonprofit animal shelter on the East Coast, Alana has spent most of the past decade caring for pets that might otherwise be euthanized. Her work also resonates with people online—the Facebook page for the shelter has more than 1.3 million followers. But in August, she noticed something strange: A series of unfamiliar posts began appearing on the page, and no one at the shelter could say where they were coming from.

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