Warning for WhatsApp users in South Africa

Legal experts warned that casual messaging now carries serious legal risks, as WhatsApp messages, voice notes and even deleted chats can be used as court evidence or trigger defamation claims.

WhatsApp has become South Africa’s most trusted communication tool – and one of its biggest legal blind spots, said VDM Incorporated’s director and head of litigation, Ann-Suhet Marx.

“From neighbourhood disputes to workplace conflicts to high‑stakes business fallouts, WhatsApp messages are now at the centre of a growing number of legal battles,” she warned.

“Yet, most South Africans have no idea how these messages are treated in court, what counts as admissible evidence, or how quickly a casual chat can escalate into a defamation claim.”

As a litigation and dispute resolution attorney, Marx said she has seen WhatsApp change from just a messaging platform to a digital paper trail with real legal consequences in recent years, leaving the public “dangerously under‑informed”.

According to Marx, WhatsApp is now one of the most common platforms used for online defamation in South Africa.

This occurs when a false and damaging statement about a person is published on a digital platform such as social media, websites, or messaging applications. For a defamation claim to succeed, five elements must be proven –

• Publication: The statement must have been made public online.
• Defamation: The content must be false and injure the person’s reputation.
• Reference: The statement must clearly identify the person defamed.
• Wrongfulness: The publication must be unlawful.
• Intention or negligence: The publisher must have intended to harm or acted carelessly.

“WhatsApp has become the modern witness, but unlike traditional documents, WhatsApp messages are fluid, editable, and easily manipulated,” Marx warned. “That creates both opportunity and risk – especially when reputations are on the line.”

Online defamation

Marx explained that under South African law, online defamation carries the same legal implications as statements made in print or broadcast media.

In the 2002 Constitutional Court case of Khumalo v Holomisa, the court ruled that online communication is subject to the same standards of accountability as traditional media.

In this case, The Sunday World published an article claiming that politician Bantu Holomisa was under police investigation for involvement with bank robbers. Holomisa sued the editor, Fred Khumalo, for defamation.

Khumalo tried to stop the case before trial by arguing that Holomisa’s claim was defective because Holomisa did not explicitly state that the allegations were false, but the court rejected his argument.

Key findings included that the court refused to add a new requirement that plaintiffs must allege and prove falsity in defamation cases.

It upheld that the existing common‑law defence of reasonable publication, seen in the 1996 case of Bogoshi v National Media, already protects freedom of expression adequately.

“A single WhatsApp message forwarded to a community group can reach hundreds of people within minutes – and cause reputational damage that is swift, severe, and legally actionable,” Marx stressed.

Screenshots, deleted messages and voicenotes

One of the biggest misconceptions Marx has encountered is the belief that a screenshot is enough to prove a case.

“It isn’t. Screenshots can be cropped, edited, or taken out of context, which is why the courts increasingly require metadata, device verification, and proof that the conversation is complete,” she said.

“People assume that if they have a screenshot, they have evidence, but without authenticity, a screenshot can collapse under scrutiny.”

This, she said, is especially important in defamation matters, where the exact wording, context, and sequence of messages determine whether a statement is unlawful.

There is also a misconception around deleted messages. Many South Africans rely on “delete for everyone” as if it’s a legal eraser.

However, Marx said, it isn’t. “Deleted messages can often be recovered through backups, device forensics, or cloud syncs,” she said.

“In defamation disputes, deleted messages may even be interpreted as an attempt to conceal wrongdoing. Bottom line – deleting a message doesn’t delete the legal consequences.”

According to Marx, voice notes, which are widely used in South Africa, are also becoming increasingly central to litigation.

“They capture tone, emotion, hesitation, and intent, making them powerful evidence in both defamation and contractual disputes,” she said.

“But they also create risk because people often say things in voice notes they would never put in writing. And because voice notes feel informal, they can become the spark that ignites a defamation claim.”

Staying on the right side of the law when using WhatsApp

Marx listed some other ways clients unknowingly break the law while trying to gather evidence. Some common mistakes include –

• Forwarding private messages without consent
• Sharing screenshots from group chats
• Accessing a partner’s phone without permission
• Recording calls or voice notes without informing the other party
• Circulating allegations in community WhatsApp groups

“These actions can violate privacy laws or even constitute crimen injuria,” she said. Crimen injuria is a crime under South African common law and is defined as the act of unlawfully and intentionally impairing another person’s dignity or privacy.

“People often think ‘if it’s on my phone, I can use it’, but the method of obtaining evidence matters – and illegally obtained evidence can be excluded or lead to counterclaims,” she warned.

Marx added that WhatsApp is also reshaping contract law. Courts are now recognising that a thumbs‑up emoji can signal agreement, a voice note can constitute acceptance, and a chat thread can form a binding contract.

This blurring of informal and formal communication is catching many South Africans off guard, Marx cautioned.

She urged South Africans to protect themselves legally by keeping backups of important conversations, avoiding cropping or editing screenshots and saving original voice notes and message files.

South Africans should also think twice before forwarding private messages, treat WhatsApp like email when discussing anything important and seek legal advice early when reputational harm occurs, she added.

“WhatsApp is convenient, but it’s not casual. Every message you send has the potential to become evidence or defamation,” she cautioned.

As WhatsApp continues to dominate communication in South Africa, its role in litigation will only expand, Marx said. “Courts are adapting, legal standards are evolving, and the public needs to catch up,” she said.

“WhatsApp has changed the way we communicate – and now it’s changing the way we litigate, so understanding the legal implications isn’t optional anymore. It’s essential.”