8. Anonymous Donor – 150 children
When looking for a mate online, usually people will check for looks, height, occupation, and interests. For the children of an anonymous American donor, they should also check that they are not shacking up with a sibling. One of the donor’s recipients set up a registry for their son so he could get to know his half siblings. When the site had more users than Facebook, the recipient knew there was a problem.
This anonymous donor is now confirmed to have at least 150 children. This is due partially because the United States has no limit on how many times a man’s sperm can be donated. Seems like “who’s your daddy” should be a part of the dating-site matching algorithms.