The rigger who died while working on the stage for Johannesburg's Global Citizen Festival has been identified as Siyabonga Ngodze.
Officials have called on those who experienced incidents of crime to come forward with more information.
Global Citizen Festival: Mandela 100 is a campaign partnership between advocacy group Global Citizen and the House of Mandela with hopes of ending poverty by 2030. It says many people won tickets to Sunday's concert through charity work and petition-signing.
But Big Concerts' Justin Van Wyk says that by law, the police is responsible for providing safety.
"We find that there's a lot of communication taking place on the social media platform, but that is not being reported to us", said, Naidoo, adding that it is therefore "very hard for us to deny or even confirm that such things have happened".
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The company will now notify users whose data has been compromised, and will invalidate passwords for users who use one to sign in. Quora suggests that users change passwords of accounts that they use on other sites if the same password was used there as well.
The Johannesburg Metro Police Department arrested seven people allegedly linked to several muggings and attacks.
She said the muggers were even pulling knives and guns on the defenceless revellers.
Police Minister Bheki Cele described the concert as "well polished" and said he had received a full briefing the morning of the concert.
Witnesses and the CEO of Stadium Management have disputed this, claiming that no police officers were visible after the last performance.
World leaders previously gathered at the stadium in 2013 for a memorial after the death of Mandela, the anti-apartheid leader who was also South Africa's first black president.