Person databases

American nonprofit organization

PhotoDNA is a proprietary image-identification and content filtering technology widely used by online service providers. Although the design of the algorithm has never been publicly disclosed, a leaked software library that implements it became accessible through a repository on GitHub in 2021.

classmates.com is an American social networking service. It was founded on November 17, 1995 by Randy Conrads as Classmates Online, Inc. and headquartered in Bellevue, Washington. It bills itself as the leading online social network service in the United States for bringing high school alumni together, with over 90 million members.