The news: Online disinformation is no longer just a political problem. Sopra Steria's new research puts the global cost of unchecked disinformation at $417 billion in 2024 alone. That number should get the attention of every CMO who buys media, runs performance campaigns, or depends on consumer trust.

Zooming in: Of that total, $393 billion represents economic impact directly distorted by information manipulation. 

• Fake online reviews are not a niche problem, accounting for the largest single slice—an estimated $227 billion in influenced consumer spending. These reviews impact ecommerce, hospitality, CPG, and retail. 
• Disinformation doesn't just distort spending, it also undermines the trust  marketers depend on. An Integral Ad Science (IAS) study found that 73% of consumers say they feel unfavorably toward brands associated with misinformation, and about two‑thirds say they are unlikely to purchase from brands that advertise near it.

AI is accelerating the damage. Sopra Steria estimates amplified economic harm by 15% to 20%. The asymmetry is striking: Meta generated $16 billion in ad revenues on fraudulent content, while Sopra Steria cites the entire global fact-checking budget is under $100 million.

Implications for marketers: Marketers are funding the disinformation ecosystem without realizing it. 

Stanford research found that companies routinely place ads on misinformation sites—not by choice, but because programmatic buying prioritizes audience targeting over content context. Marketers need stricter audit trails between their ad spend and the content it funds.

• The visibility gap is the core problem. As Stanford Digital Economy Lab Director Erik Brynjolfsson noted, advertisers receive detailed demographic data on who sees their ads, but little to no information about the sites carrying them.
• That blind spot has a cost—measured not just in wasted impressions, but in brand association with content that actively works against consumer confidence.

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