You're presumed at fault unless you show you tried hard enough
Em um momento que marca uma virada na relação entre o Estado e as grandes plataformas digitais, o Supremo Tribunal Federal do Brasil estabeleceu, na quinta-feira, um prazo de sessenta dias para que as gigantes da tecnologia se adequem a um novo regime de responsabilidade sobre conteúdos gerados por usuários. A decisão, construída em torno da proposta do ministro Dias Toffoli e apoiada por seis colegas, inverte uma lógica que por anos protegeu as plataformas: agora, cabe a elas provar que agiram com diligência, e não ao Estado provar que falharam. Trata-se de um reposicionamento profundo sobre quem carrega o ônus da vigilância no espaço digital.
- O STF formou maioria para exigir que Meta, Google, TikTok e outras plataformas reestruturem seus sistemas de moderação em apenas sessenta dias — um prazo que combina urgência institucional com exposição jurídica real.
- A introdução da 'presunção relativa de culpa' rompe com a lógica anterior: plataformas não podem mais aguardar uma ordem judicial para agir diante de conteúdo ilegal em anúncios pagos e impulsionamentos.
- O ônus da prova se inverte — as empresas precisam demonstrar que exerceram diligência razoável em tempo razoável, ou serão responsabilizadas, independentemente de notificação.
- O ministro Flávio Dino, embora alinhado à proposta de Toffoli, sinalizou interesse em ampliar o alcance das regras para além das grandes plataformas, o que pode expandir o impacto da decisão para todo o ecossistema digital.
- Os termos 'diligência razoável' e 'prazo razoável' permanecem sem definição precisa, tornando-se o próximo campo de batalha jurídica assim que o prazo de adequação expirar.
O Supremo Tribunal Federal deu um passo decisivo na quinta-feira para redefinir as responsabilidades das grandes empresas de tecnologia no Brasil, abrindo um prazo de sessenta dias para que plataformas de mídia social e comércio digital se adaptem a novas regras sobre conteúdo de terceiros. A sessão plenária convergiu em torno da proposta do ministro Dias Toffoli, que reuniu o apoio de seis colegas — Flávio Dino, Cristiano Zanin, André Mendonça, Kassio Nunes Marques e Alexandre de Moraes entre eles — formando a maioria necessária para avançar.
A decisão tem raízes em junho de 2025, quando o próprio STF declarou parcialmente inconstitucional o artigo 19 do Marco Civil da Internet, preservando a responsabilidade das plataformas pelo que seus usuários publicam. O que mudou agora foi a linguagem e as condições dessa responsabilidade. Toffoli substituiu a expressão 'presunção de responsabilidade' por 'presunção relativa de culpa' — uma distinção com efeitos práticos significativos: no caso de anúncios pagos e conteúdos impulsionados, as plataformas podem ser responsabilizadas sem necessidade de ordem judicial prévia, a menos que consigam demonstrar que agiram com diligência razoável dentro de um prazo razoável.
A inversão do ônus da prova é o coração da mudança. Empresas como Meta, Google e TikTok não podem mais aguardar passivamente para serem notificadas de que falharam — precisam provar que tentaram agir. O prazo de sessenta dias representa uma janela de adequação, não uma folga: quando ele terminar, começa a exposição jurídica real. O que ainda está por definir — e que certamente alimentará litígios futuros — é o significado preciso de 'diligência razoável', um conceito que o tribunal deverá ir moldando caso a caso.
Brazil's Supreme Court moved decisively on Thursday to reshape how technology companies police their platforms, establishing a sixty-day window for the giants of social media and digital commerce to align themselves with new rules governing user-generated content. The court's plenary session crystallized around Justice Dias Toffoli's proposal, which six of his colleagues ultimately supported, creating the majority needed to move forward on what amounts to a significant recalibration of platform responsibility.
The framework being implemented traces back to June 2025, when the same court had already declared part of Brazil's Internet Civil Rights Framework—specifically Article 19—partially unconstitutional. That earlier ruling, decided 8 to 3, preserved the core principle that platforms remain accountable for what their users post. What changed Thursday was the language and the conditions under which that accountability applies.
Toffoli's approach introduces what he calls a "relative presumption of guilt" to replace the previous terminology of "presumption of responsibility." The distinction matters in practice. Under the new framework, a platform can be held liable for illegal content in paid advertisements and promoted posts without waiting for a court order to act—but only if the company cannot demonstrate that it exercised reasonable diligence within a reasonable timeframe. The burden shifts: platforms must now show they tried, not wait to be told they failed.
Five other justices aligned with Toffoli's reasoning: Flávio Dino, Cristiano Zanin, André Mendonça, Kassio Nunes Marques, and Alexandre de Moraes. Their agreement formed the decisive bloc, though the full court had not yet completed its deliberations when the session was suspended. The voting pattern suggests the proposal will likely survive any remaining objections, though at least one justice—Dino, despite his support for Toffoli—has signaled interest in extending these rules beyond the largest tech companies to capture a broader ecosystem of digital platforms.
The practical effect is immediate and consequential. Companies like Meta, Google, TikTok, and others operating in Brazil now face a hard deadline to restructure their content moderation systems, their liability frameworks, and their internal policies around paid promotion and algorithmic amplification. The court is not merely asking for compliance; it is establishing a legal standard that presumes fault unless the company can prove otherwise—a reversal of the traditional burden of proof that has long favored platforms.
What remains unclear is how strictly the court will interpret "reasonable diligence" and "reasonable timeframe." Those terms will almost certainly become the subject of future litigation as companies test the boundaries and as the court refines its own understanding through individual cases. For now, the sixty days represent a grace period, not a reprieve. The real work of compliance—and the real legal exposure—begins when that clock runs out.
Notable Quotes
A platform can be held liable for illegal content in paid advertisements and promoted posts without waiting for a court order to act—but only if the company cannot demonstrate that it exercised reasonable diligence within a reasonable timeframe.— Justice Dias Toffoli's proposal, as adopted by the court majority
The Hearth Conversation Another angle on the story
Why did the court feel it needed to change the language from "presumption of responsibility" to "relative presumption of guilt"?
Because the first term left platforms in a gray zone. They could argue they weren't responsible until proven otherwise. The new language flips that: you're presumed at fault unless you show you tried hard enough to stop it.
But doesn't that make it harder for the platforms to defend themselves?
In theory, yes. But Toffoli built in an escape hatch—if you can prove reasonable diligence in reasonable time, you're off the hook. The question is whether any company can actually prove that at scale.
What does "reasonable" mean here? That seems like it could mean anything.
Exactly. That's the real battle ahead. A platform might say forty-eight hours is reasonable. A judge might say it should be four hours. That ambiguity is where the next five years of litigation will happen.
Why did Dino vote with Toffoli but also signal he wants to go further?
He's thinking bigger picture. Toffoli's ruling targets the giants, but Dino sees a whole ecosystem of smaller platforms doing the same harm. He wants the rules to catch them too.
Does this actually change how Brazilians experience the internet?
Not immediately. But yes, eventually. If platforms have to be faster and more aggressive about removing paid illegal content, the feed changes. What gets amplified changes. The incentive structure shifts.