The story
Founded by David Sacks on Jun 2006.1
Lists can be compiled of profiles that are expected to have the same haplogroup as a specific profile, since they are related on a strict male line or female line.
Genealogical DNA test results (autosomal tests, YDNA tests and MtDNA tests) can be imported from various test sites. The haplogroup of the test person is indicated and propagated in the family tree to all profiles that are expected to share it. Lists of tested people matching the DNA are presented.
From Wikipedia’s article on Geni.com, shared under CC BY-SA 4.0.4