Roundup
30,000 and Counting — The Roundup Campaign That Proved Facebook Was Built for Mass Torts
$50M+ in Facebook ad spend, 30,000 blood cancer victims signed
30,000
blood cancer victims signed
Background. For decades, Roundup — the popular weedkiller manufactured by Monsanto (later acquired by Bayer) — was marketed as safe. As lawsuits mounted linking glyphosate to non-Hodgkin's lymphoma and other blood cancers, the tide turned. Mass Tort Ad Agency built the campaign in partnership with IntakeDesk and attorney Howard Kastner — a collaboration that ran for over five years.
Strategy. Advertising (Mass Tort Ad Agency) generated qualified leads through high-budget creative campaigns. Intake (IntakeDesk) converted leads with care and precision. Partnership (Howard Kastner) provided long-term commitment and vision. Facebook's algorithm learned what a Roundup mass tort client looked like and used Lookalike Audiences to scale exponentially — years of data refinement meant higher quality leads at lower cost.
Results. $50 million+ spent on Facebook ads. 30,000 individuals suffering from blood cancers signed and supported. One of the longest-running and largest single-tort Facebook campaigns in legal advertising history.
"What I saw with Roundup is why I came to Facebook in the first place. No platform knows more about us — our interests, our pain points, our needs." — Jacob Malherbe
How does Roundup mass tort marketing actually work on Facebook?
Roundup tort campaigns on Facebook succeed because the platform's data infrastructure matches the profile of a qualifying claimant — someone who used the product, likely in a specific context (farming, landscaping, residential lawn care), and has since been diagnosed with non-Hodgkin's lymphoma or another blood cancer. Mass Tort Ad Agency builds creative that speaks directly to that lived experience, runs it at scale, and feeds conversion data back into Facebook's algorithm. Over time, the system learns what a verified Roundup claimant looks like and surfaces more of them through Lookalike Audiences. That feedback loop is what drove our five-year campaign past 30,000 signed clients — early investment in data quality compounded into lower acquisition costs and higher retainer rates as the campaign matured.
For plaintiff firms evaluating Roundup tort campaigns today, the key question is whether you have the intake infrastructure to match the volume a well-funded Facebook campaign can produce. Our partnership model with IntakeDesk was built around exactly that constraint — advertising and intake operated as a single system, not two separate vendors. If your firm is considering entering a Roundup campaign or scaling an existing one, that integration between lead generation and retainer conversion is where most campaigns lose value, and where we focus first.