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In 2011, a massive data breach occurred on the popular Russian social networking site Odnoklassniki, also known as OK.ru. The leak exposed the personal information of over 8.2 million users, including their names, email addresses, phone numbers, and location data.

The breach was discovered by security researchers who found a vulnerability in the sites code that allowed access to the user database. The researchers then leaked the data to the public, exposing the private information of millions of people.

The OK.ru leak is one of the largest data breaches in history and has raised concerns about the security of personal information stored on social media sites. The breach has also led to investigations by law enforcement agencies and has prompted changes to data protection laws in many countries.