But Zuckerberg’s suggestion that this dialog box gives users complete control is misleading.
This is why Zuckerberg was called to Capitol Hill in the first place: Users haven’t had and still don’t have an easy way to control who sees their data after it’s been posted to Facebook.
Cambridge Analytica, for example, was able to obtain information on as many as 87 million Facebook users after just 270,000 people downloaded and interacted with a quiz. (Here’s how to find out if you were one of them.)
While this occurred several years ago, and Facebook says it has made changes to prevent this sort of leak, there are more than 86 million people who never intended to have their data shared with a third party. However, because a friend of those users took a quiz, that data was shared elsewhere.
At the time, there was no setting to prevent that.
Facebook is still trying to figure out other firms that might have gotten access to personal user data in similar ways, which means it has no idea who might currently have your private information. For example, the company suspended another data analytics firm named CubeYou only after CNBC revealed that the firm was running a quiz that was also collecting user data.
In order to protect yourself better from these sorts of invasions, you do need to dig deeper — much deeper than Zuckerberg suggests — into your Facebook settings.
Source : CNBC