A new dataset containing records of 4 million 23andMe users has been leaked online after genetic data of 1 million users was published on the dark web last week, TechCrunch. A hacker who goes by Golem, who published the dataset, said it includes data from "the wealthiest people living in the U.S. and Western Europe." A 23andMe spokesperson said the genetic testing service is "reviewing the data to determine if it is legitimate."