For too long, dominant tech platforms have hidden behind Section 230 of the Communications Decency Act, claiming immunity for any harm caused by third-party content they host or promote. But as platforms like TikTok, YouTube, and Google have long ago moved beyond passive hosting into highly personalized, behavior-shaping recommendation systems, the legal landscape is shifting in the personal injury context. A new theory of liability is emerging—one grounded not in speech, but in conduct. And it begins with a simple premise: the duty comes from the data.

Surveillance-Based Personalization Creates Foreseeable Risk

Modern platforms know more about their users than most doctors, priests, or therapists. Through relentless behavioral surveillance, they collect real-time information about users’ moods, vulnerabilities, preferences, financial stress, and even mental health crises. This data is not inert or passive. It is used to drive engagement by pushing users toward content that exploits or heightens their current state.

If the user is a minor, a person in distress, or someone financially or emotionally unstable, the risk of harm is not abstract. It is foreseeable. When a platform knowingly recommends payday loan ads to someone drowning in debt, promotes eating disorder content to a teenager, or pushes a dangerous viral “challenge” to a 10-year-old child, it becomes an actor, not a conduit. It enters the “range of apprehension,” to borrow from Judge Cardozo’s reasoning in Palsgraf v. Long Island Railroad (one of my favorite law school cases). In tort law, foreseeability or knowledge creates duty. And here, the knowledge is detailed, intimate, and monetized. In fact it is so detailed we had to coin a new name for it: Surveillance capitalism.

Algorithmic Recommendations as Calls to Action

Defenders of platforms often argue that recommendations are just ranked lists—neutral suggestions, not expressive or actionable speech. But I think in the context of harm accruing to users for whatever reason, speech misses the mark. The speech argument collapses when the recommendation is designed to prompt behavior. Let’s be clear, advertisers don’t come to Google because speech, they come to Google because Google can deliver an audience. As Mr. Wanamaker said, “Half the money I spend on advertising is wasted; the trouble is I don’t know which half.” If he’d had Google, none of his money would have been wasted–that’s why Google is a trillion dollar market cap company.

When TikTok serves the same deadly challenge over and over to a child, or Google delivers a “pharmacy” ad to someone seeking pain relief that turns out to be a fentanyl-laced fake pill, the recommendation becomes a call to action. That transforms the platform’s role from curator to instigator. Arguably, that’s why Google paid a $500,000,000 fine and entered a non prosecution agreement to keep their executives out of jail. Again, nothing to do with speech.

Calls to action have long been treated differently in tort and First Amendment law. Calls to action aren’t passive; they are performative and directive. Especially when based on intimate surveillance data, these prompts and nudges are no longer mere expressions—they are behavioral engineering. When they cause harm, they should be judged accordingly. And to paraphrase the gambling bromide, the get paid their money and they takes their chances.

Eggshell Skull Meets Platform Targeting

In tort law, the eggshell skull rule (Smith v. Leech Brain & Co. Ltd. my second favorite law school tort case) holds that a defendant must take their victim as they find them. If a seemingly small nudge causes outsized harm because the victim is unusually vulnerable, the defendant is still liable. Platforms today know exactly who is vulnerable—because they built the profile. There’s nothing random about it. They can’t claim surprise when their behavioral nudges hit someone harder than expected.

When a child dies from a challenge they were algorithmically fed, or a financially desperate person is drawn into predatory lending through targeted promotion, or a mentally fragile person is pushed toward self-harm content, the platform can’t pretend it’s just a pipeline. It is a participant in the causal chain. And under the eggshell skull doctrine, it owns the consequences.

Beyond 230: Duty, Not Censorship

This theory of liability does not require rewriting Section 230 or reclassifying platforms as publishers although I’m not opposed to that review. It’s a legal construct that may have been relevant in 1996 but is no longer fit for purpose. Duty as data bypasses the speech debate entirely. What it says is simple: once you use personal data to push a behavioral outcome, you have a duty to consider the harm that may result and the law will hold you accountable for your action. That duty flows from knowledge, very precise knowledge that is acquired with great effort and cost for a singular purpose–to get rich. The platform designed the targeting, delivered the prompt, and did so based on a data profile it built and exploited. It has left the realm of neutral hosting and entered the realm of actionable conduct.

Courts are beginning to catch up. The Third Circuit’s 2024 decision in Anderson v. TikTok reversed the district court and refused to grant 230 immunity where the platform’s recommendation engine was seen as its own speech. But I think the tort logic may be even more powerful than a 230 analysis based on speech: where platforms collect and act on intimate user data to influence behavior, they incur a duty of care. And when that duty is breached, they should be held liable.

The duty comes from the data. And in a world where your data is their new oil, that duty is long overdue.