San Francisco : Facebook has warned investors that more users' data scandals in the future may adversely affect the social networking giant's reputation and brand image. In its quarterly report shared with the US Securities and Exchange Commission (SEC), without mentioning Cambridge Analytica, Facebook said that its ongoing investments in safety, security, and content review will identify additional instances of misuse of user data. "We may also be notified of such incidents or activity via the media or other third parties," Facebook has said. Appearing before the US Congress, Facebook CEO Mark Zuckerberg told the lawmakers that his own personal data was part of 87 million users' that was "improperly shared" with the British political consultancy firm. The data was gathered via a quiz app, "thisisyourdigitallife," developed by Aleksandr Kogan, then a psychology researcher with University of Cambridge, and his company Global Science Research (GSR) which pulled out Facebook users' data in 2014-2015.