The internet is dark and full of terrible sources of information. Sometimes it seems like every day brings a new one to the list. There are the toxic conspiracy theories, deepfakes, and fake news mills. And then there are good old-fashioned internet hoaxes. You know the ones—the sort of fear-mongering, copypasta-esque warnings that came in the form of cryptically bolded email chains a decade ago, and today dot the social media feeds of your friends and relatives.

In comparison to the targeted disinformation campaigns that have dominated headlines in recent years, social media hoaxes seem almost quaint. Aw, we used to get duped by all-caps chain texts that claimed we would end up cursed if we didn’t forward it to five of our friends!

That is, at least, until you realize that they’re somehow still around.

The most recent iteration roared into the public consciousness earlier this week, after users—including some celebrities and high-profile public figures—took to Instagram to share a poorly photoshopped photo of a typo-ridden creed perpetuating an old hoax. The meme, which again, is totally fake, claims an imminent change to Instagram’s privacy policy could cause "everything you've ever posted ... even messages that have been deleted or the photos not allowed [sic]" to become public, and will give Instagram permission to use your photos and data “in court cases in litigation against you.” It goes on to claim that the only way to protect your precious intellectual property and dear DMs is to share the following message and warning, which will totally, definitely stop Instagram from being able to make any claim to your data.

Paris Martineau covers platforms, online influence, and social media manipulation for WIRED.

Like the Momo challenge and most other hoaxes before it, it was nonsensical and easily debunked by a quick Google search—and, of course, quickly went viral anyway.

Make no mistake, it’s not because people are stupid, says Whitney Phillips, a professor at Syracuse University who studies misinformation and how it is amplified online. These sorts of hoaxes have staying power because of the peculiar way people process information and arrive at beliefs. When confronted with new information, humans don’t always do the logical thing and evaluate it on its own merits, Phillips says. Instead, we often make snap decisions based on how the information adheres with our existing worldviews.

If the story pushed by a meme or hoax fits in a way that feels like a coherent narrative to a critical mass of people, it’s game over, says Phillips. She credits this phenomenon with playing a major role in the duping of upwards of a dozen celebrities on Tuesday.

“If you're a celebrity in particular, you're going to have some additional sensitivities to the exposure of personal private information, because there's a market for your personal private information above and beyond the average person's” (see: the Fappening). “So it makes a lot of sense that these are the kinds of narratives that would resonate with people,” Phillips explains. “That doesn't mean at all that they're even the tiniest bit true. But that's not how belief works.”

The narrative that Big Bad Instagram is going to take all of your most intimate personal data points and use them for nefarious secret purposes is the sort of story that is primed to appeal to the average person, as well, Phillips says, because it contains a kernel of truth: You have all this data out there on the internet, and God knows who has access to it. Chances are, at some point, some part of it will end up being used in a way that you don’t want, and you have no control over it whatsoever.

Of course, it doesn’t help that the very same platforms where so much info is shared are the vectors through which the misinformation designed to co-opt that fear spreads.