How to Check If Cambridge Analytica Could Access Your Facebook Data | WIRED. Facebook is taking steps to prevent third party apps from accessing the personal data of Facebook users and their friends. This Wired article explains how it was done, and will take you to a page that will tell you if you are one of those who used the site, or whose Facebook friends used the site that mined the data. This is a cautionary tale. Don't fill out social media app questions that ask for personal information. Don't respond to phishing emails that ask for personal information. Don't put private information up on the web. Of course, to access banking, retail, and other sites, this can be required. But, you can verify the site is secure, and take other steps to secure your personal information. Learn how. Then, do it.