On yesterday, Facebook put measures in place to identify users who were affected by Cambridge Analytica's harvesting of the personal information of up to 87 million users. That data was used to target voters in the 2016 presidential election and passed along to Trump.
A researcher, named Alexander Kogan created a personality quiz in 2014 that 270,000 users installed. The quiz allowed him to steal the personal information of Facebook users.
Facebook has banned the website 'This Is Your Digital Life'. This website may have misused some of your Facebook information by sharing it with Cambridge Analytica. Facebook also released a tool which allows you to learn more about what happened and how you can remove other apps and websites when you no longer want them to have access to your information.
At the top of your News feed on your Facebook page, you will see one of two links under the "Protecting Your Information" header. The first one "SEE HOW YOU WERE AFFECTED" focuses on Cambridge Analytica. The other link "Go TO the APPS and WEBSITES" provides more general guidance about controlling which apps and websites can have access to your data.