DNA Explainer: How to check you are among 533 million Facebook users whose data was leaked online The personal information of over 533 million Facebook users was leaked online which include contact numbers, Facebook IDs, birthdates and much more. (Image Source: Pixabay) Updated: Apr 7, 2021, 05:00 PM IST If you are a Facebook user then you may be at risk of your data been leaked online for free. This may mean your phone number, ID, photos, birthdates etc could have been seen by others without your permission. Recently there has been a massive data breach by social networking service Facebook where the personal information of over 533 million users was leaked online. These range from contact numbers of the users to Facebook IDs, birthdates, friend lists, and much more.