https://www.cnbc.com/2018/06/16/genetic-testing-sites-social-networks.html

Three years ago Dyan deNapoli, a 57-year-old author and TED speaker who specializes in penguins, was given a 23andMe genetic testing kit for her birthday. Intrigued, she spit in the tube and sent the results to a lab in Burlington, N.C.

About two months later she received a pie chart breaking down where her ancestors lived (99.4 percent of them were from Europe). What she was most giddy about, however, was a 41-page list of all the people who had done the test and were genetically related to her: 1,200 in all. (Customers can choose whether their information is shared with others.)