In May 2016, Kirkegaard and Julius Daugbjerg Bjerrekær published a paper in Open Differential Psychology that includes the data of nearly 70,000 OkCupid (a dating website) users, such as their intimate sexual details. The publication was widely criticised at the time and been described as "without a doubt one of the most grossly unprofessional, unethical and reprehensible data releases."Besnick, Brain. (12 May 2018). Researchers just released profile data on 70,000 OkCupid users without permission . Vox. Although Kirkegaard claims the data is public, this is disputed by others who point out the data is restricted to logged-in users only:
