How misinformation shapes electoral decisions and affects democracy

The circulation of false and distorted information has established itself as one of the greatest challenges to the stability of contemporary democracies, profoundly altering the dynamics of electoral campaigns. In a scenario where the speed of communication outpaces the capacity to verify facts, voter decision-making is directly affected by narratives constructed to manipulate emotions and reinforce prejudices. Understanding the mechanics of this phenomenon and its historical, psychological, and technological ramifications is fundamental to preserving the integrity of public debate and ensuring the sovereignty of the popular vote.

How falsehood shaped political history before the internet

Misinformation is not an exclusive product of the digital era. Since antiquity, the deliberate spread of rumors and slander has been used as an instrument for power struggles and government destabilization. In ancient Rome, public defamation campaigns were orchestrated through impassioned speeches and wall inscriptions to ruin the reputation of generals and senators. With the invention of the movable-type printing press in the 15th century, the capacity to spread false narratives gained industrial scale, allowing apocryphal pamphlets and sensationalist newspapers to influence revolutions and armed conflicts throughout the modern and contemporary eras.

In Brazil, the manipulation of public opinion also has deep roots. Throughout the imperial period and the Old Republic, partisan press and local tabloids were frequently used by regional oligarchies to disqualify political opponents and invent conspiracies that justified authoritarian interventions. In the mid-20th century, broadcasting and mass-circulation printed newspapers played crucial roles in propagating social alarmism and conspiracy theories that culminated in democratic breakdowns and severe institutional crises. Political falsehood, therefore, has always functioned as a technology of social control, adapting to the communication media available in each era.

The great transformation that occurred during the transition to the 21st century lies not in the intention to deceive, but rather in the speed, reach, and personalization of the falsehood. In the past, producing a rumor required the physical printing of pamphlets or access to radio and television concessions—channels that went through editorial filters and significant financial barriers. Today, any individual equipped with a mobile device connected to the internet can act as a sender of messages to millions of people, eliminating traditional intermediaries of journalistic mediation and creating a continuous flow of unverified content that challenges the limits of state and social regulation.

The digital engineering behind the viral spread of rumors

To understand the impact of misinformation on modern elections, one must analyze the technical functioning of social networks and search engines. Digital platforms operate under a business model based on the attention economy, whose main objective is to keep the user connected for as long as possible to maximize the display of advertisements. To achieve this goal, recommendation algorithms are programmed to give visibility to content that generates high engagement rates, measured by interactions such as shares, comments, and emotional reactions.

It turns out that messages evoking intense feelings—such as indignation, fear, anger, and repulsion—have a significantly higher sharing potential than news based on complex facts, technical data, or balanced analyses. Misinformation is custom-designed to exploit these emotional vulnerabilities, using sensationalist headlines, manipulated images, and simplistic narratives that offer scapegoats for complex social problems. As a direct consequence of this algorithmic dynamic, rumors travel much faster and more comprehensively than their respective corrections or refutations, creating a structural imbalance in the marketplace of ideas.

Beyond open social networks, private messaging applications with end-to-end encryption play a central role in the spread of harmful content, especially in the Brazilian scenario. These channels function as invisible distribution networks where communication occurs in closed groups and family or work environments. The absence of public moderation in these spaces makes it difficult to identify coordinated disinformation campaigns and prevents fact-checking agencies from inserting context alerts. Within these private networks, interpersonal trust acts as a seal of credibility: when a rumor is shared by a relative or close friend, the receiver tends to accept the information without questioning its origin or truthfulness.

The psychological impact of misleading narratives on the voter

The effectiveness of misinformation depends not only on the technology that distributes it, but also on how the human mind processes information. Cognitive psychology demonstrates that individuals are not passive and purely rational receivers of data; on the contrary, the human brain uses mental shortcuts to simplify decision-making and conserve cognitive energy. One of the best-known mechanisms is confirmation bias—the natural tendency to seek, interpret, and remember information in a way that confirms pre-existing beliefs and worldviews, actively rejecting any evidence to the contrary.

When a voter is exposed to fake news that attacks a candidate they already distrusts or that praises a political leader they support, the tendency is for this information to be accepted immediately as true, without any effort to verify its origin. This process is amplified by the illusory truth effect, a cognitive phenomenon whereby the continuous repetition of a statement increases the likelihood that people will consider it true, regardless of its factual falsehood. Repeated exposure to identical rumors across multiple digital channels creates a sense of social consensus, leading the individual to believe that if many people are sharing that story, it must have some truth to it.

This scenario favors the creation of informational bubbles and echo chambers, virtual environments where users interact only with like-minded people and consume the same sources of information. Within these bubbles, dissent is punished with ostracism, and healthy debate is replaced by mutual radicalization. Political polarization ceases to be a healthy divergence over country projects and turns into an existential division, in which the political opponent is not seen as someone with different ideas, but rather as a moral enemy who must be defeated at all costs. Under the effect of this division, the voter's capacity for critical analysis is severely compromised, rendering them vulnerable to large-scale manipulation.

The destabilization of the choice process and defensive voting

In the weeks leading up to an election, the circulation of misinformation reaches its peak, directly interfering with the citizen's free choice. One of the most common strategies consists of creating artificial crises and last-minute personal scandals against specific candidates. Because the response time of attacked campaigns and regulatory bodies is limited, these unfounded accusations can solidify an irreversible negative image in the minds of undecided voters, who often change their vote not out of affinity with a proposal, but due to fear generated by a deliberate lie.

This phenomenon constitutes so-called defensive voting or voting for the lesser of two evils, in which the voter's choice is guided by deep rejection of a fabricated threat, rather than by programmatic debate on health, education, public safety, or the economy. By shifting the focus of discussions to empty moral controversies or absurd conspiracy theories, misinformation impoverishes public debate and prevents citizens from realistically evaluating the actual government proposals and administrative records of competitors. The result is the election of representatives based on distorted expectations and false premises, which compromises the quality of political representation.

Another alarming aspect of electoral misinformation is the direct attack on the integrity of the voting system itself. Coordinated campaigns that question the security of electronic voting machines, the fairness of tallying processes, and the impartiality of electoral authorities aim to sow widespread distrust regarding the election results. When citizens come to believe that the voting process is fraudulent or manipulated, two serious consequences arise: an increase in electoral abstention, as the demotivated voter fails to show up at the polls considering their vote will make no difference, and the non-acceptance of legitimate results by the defeated side, paving the way for violent protests, political instability, and attempts at institutional rupture.

The paths to regulation and the role of tech platforms

Combating misinformation requires coordinated action involving the public sector, technology companies, and organized civil society. Historically, the debate over internet regulation oscillates between the need to protect the integrity of the democratic process and the preservation of freedom of expression, a fundamental right that cannot be curtailed by prior state censorship. Finding the balance between these two pillars is one of the most complex tasks for public policymakers and the judiciary in Brazil and worldwide.

Technology platforms, which for many years positioned themselves as mere neutral content intermediaries, have been pressured to assume a more active editorial and social responsibility. This includes developing more efficient content moderation mechanisms, demonetizing channels that systematically propagate lies for profit, and labeling posts containing false or inaccurate information while directing users to official and verified sources. However, the application of these measures faces technical difficulties due to the monumental volume of data generated daily and the resistance of the companies themselves to alter their engagement algorithms, which form the basis of their profitability.

In this context, the work of independent fact-checking agencies and the role of the Brazilian Electoral Justice gain extraordinary relevance. Journalistic verification consists of investigating the veracity of public speeches, message chains, and viral posts, presenting documentary proof, official data, and historical contexts that re-establish the truth of facts. In turn, the Electoral Justice acts to curb abuses of economic power and the illicit use of mass-dispatch technological tools during campaigns, applying sanctions ranging from the removal of offensive content to the revocation of candidacies, seeking to ensure equal conditions among competitors and the fairness of the contest.

Building social immunity through media literacy

Although regulatory and technological measures are indispensable, they are not sufficient to eradicate the problem of misinformation, which has deep cultural and educational roots. The long-term solution requires strengthening social immunity against falsehood, which is achieved through the development of media literacy programs aimed at all age groups of the population. Just as traditional literacy taught citizens to read and write, digital and media literacy must empower people to consume, produce, and share information critically and responsibly in the virtual environment.

Media literacy teaches citizens to adopt a stance of healthy skepticism toward content that provokes extreme emotional reactions or seems too good to be true. Simple techniques—such as lateral reading, which consists of researching what other credible media outlets say about the same subject before sharing a post, verifying the publication date of old news taken out of context, and identifying primary sources of information—must be integrated into school curricula and promoted in public awareness campaigns.

By empowering Brazilian voters to discern between fact-based professional journalism and deceptive propaganda disguised as news, a society more resilient to external and internal manipulation is built. A well-informed electorate aware of its digital rights and duties is the greatest guarantee that decisions at the ballot box will reflect the true aspirations and needs of the population, strengthening democratic institutions and ensuring that the vote continues to be the sovereign instrument of social and political transformation in the country.