https://www.theguardian.com/technology/2018/apr/10/just-53-australians-used-facebook-app-responsible-for-cambridge-analytica-breach

Most of 310,000 Australians affected by breach did not directly consent to harvesting of their personal details

Only 53 Australians used a Facebook quiz app responsible for the Cambridge Analytica data breach, meaning the vast majority of 310,000 affected citizens did not directly consent to the harvesting of their personal details.