Snake Oil Had an Algorithm: The 19th Century Already Figured Out Influencer Marketing

Let's be direct about something: the reason a post from a fitness influencer can make you consider spending $60 on a supplement you've never heard of isn't because social media is uniquely powerful. It's because human beings have a specific, well-documented, thoroughly exploited tendency to trust people they admire and to read popularity as a signal of quality. That tendency is not new. It is, in fact, very old, and the people who figured out how to monetize it in the 19th century did so with a sophistication that should make any modern marketing director feel slightly less original.

This is the argument the historical record keeps making: we don't discover new manipulation techniques. We rediscover old ones, dress them up in the technology of the moment, and act surprised when they work.

Lydia Pinkham Knew Exactly What She Was Doing

Lydia E. Pinkham's Vegetable Compound hit the market in 1875, and by the 1880s it was one of the best-selling patent medicines in the United States. The compound — which contained significant quantities of alcohol alongside a mix of herbs — was marketed primarily to women as a treatment for "female complaints," a category broad enough to cover essentially any symptom a woman might report.

What made Pinkham's campaign remarkable wasn't the product. It was the face.

Lydia Pinkham's portrait appeared on every bottle, every advertisement, and every piece of marketing collateral the company produced. Her image was one of the most widely reproduced photographs in 19th-century America — a grandmother figure, warm and trustworthy, looking directly at the consumer. The company invited women to write to Lydia personally with their health questions, and for years the correspondence department answered those letters under her name, maintaining the fiction of a personal relationship long after Lydia herself died in 1883.

Break that down and you have: a recognizable personal brand built around a specific face and persona, parasocial relationship maintenance with the customer base, and the manufactured impression of direct personal access to someone who cares about you. The mechanics are identical to what a mid-tier wellness influencer runs on Instagram today. The platform changed. The psychology is the same paragraph.

The Railroads Invented the Testimonial Industrial Complex

In the 1870s and 1880s, the major American railroad companies faced a marketing problem that would be familiar to anyone who's tried to sell real estate in an unfamiliar market: they had enormous quantities of land to sell in places their target customers had never been and couldn't easily visit. The solution they developed was, in retrospect, a masterclass in manufactured social proof.

The Burlington and Missouri River Railroad — operating in Nebraska and Iowa — ran one of the most aggressive testimonial campaigns of the era. The company solicited letters from settlers who had purchased land and were willing to go on record about their success. These testimonials were compiled into promotional pamphlets, printed in multiple languages for distribution to immigrant communities in the eastern US and Europe, and given the visual weight of documentary evidence. The settlers were real. The letters were real. The selection and framing were entirely controlled by the railroad.

Jay Cooke, the financier behind the Northern Pacific Railroad, took this further in the early 1870s by recruiting journalists and clergymen to write favorably about the lands along the Northern Pacific route. Cooke's operation specifically targeted figures with existing credibility in their communities — the 19th-century equivalent of reaching out to an account with a trusted niche audience. The pitch was the same one influencer agencies make today: your audience trusts you, we need that trust, here is compensation for access to it.

The Northern Pacific's promotional material described the lands along its route as the "Banana Belt" — a term Cooke's operation coined and seeded into public discourse through these trusted intermediaries. It was a hashtag campaign without the hashtag.

P.T. Barnum Was Running a Creator Economy

Phineas Taylor Barnum is usually remembered as a showman, but his career is more precisely understood as a sustained experiment in celebrity manufacture and audience psychology. His 1850 promotion of Jenny Lind — the Swedish opera singer he brought to the United States for a concert tour — is one of the most studied marketing campaigns in American history, and it works exactly like a modern viral launch.

Barnum had never heard Lind perform when he signed her. He didn't need to. He understood that the anticipation of quality, properly amplified, creates its own demand. Months before Lind arrived in the US, Barnum flooded American newspapers with stories about her European fame, her charitable giving, her personal virtue, and her extraordinary voice. He created a public persona for a woman the American public had no direct experience of, and he did it entirely through intermediaries — newspaper editors who printed what he sent them, public figures who were positioned to vouch for her reputation.

By the time Jenny Lind stepped off the boat in New York in September 1850, an estimated 30,000 people were waiting at the dock. She had 93 sold-out shows. The tour grossed what would be tens of millions of dollars in today's money. None of those 30,000 people at the dock had heard her sing. They had been told, by sources they trusted, that she was worth seeing.

That's a pre-roll ad. That's an unboxing video. That's a countdown timer on a product drop page. The specific mechanism is different. The underlying move — borrow someone else's credibility to pre-sell an experience — is identical.

Why We Keep Falling For It

The honest answer is that the techniques work because they're exploiting something real. Social proof — the tendency to use other people's behavior and opinions as a guide for our own — is a genuinely useful cognitive shortcut in most contexts. In a world with too much information and too little time, trusting the judgment of people you respect is often a reasonable strategy. The problem is that the shortcut can be hacked, and once someone figures out how to hack it, they publish the method, and everyone starts using it.

Lydia Pinkham's company figured out that a trusted face on a bottle changes purchasing behavior. The railroads figured out that a credible third-party voice is more persuasive than a direct sales pitch. Barnum figured out that manufactured anticipation creates real demand. These aren't 19th-century discoveries that we've since moved past. They're operating principles that have been continuously in use, with minor technological updates, for 150 years.

The next time an influencer you follow posts about a product they're "genuinely obsessed with," you're not watching something the internet invented. You're watching a very old play run on very new infrastructure. The script hasn't changed because the audience — meaning your brain, and mine — is running the same software it was running when Lydia Pinkham's face was staring out from a bottle of 18% alcohol and dried herbs.

History isn't just the past. Sometimes it's the pop-up ad you just closed.