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I've also included some details about GEDmatch, which doesn't need to have a sale, as it's free! In the event you haven't heard about it, I encourage everyone who has tested at FamilyTreeDNA (their Family Finder test), AncestryDNA, and 23andMe to upload their data to GEDmatch, as it has various comparison tools not available elsewhere – and it gives you additional matches to others who used a different DNA testing company from you.

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As an alternative to using chromosome mapping as described above, I've created a chromosome map of adoptees who match me and my close relatives (both parents, and an uncle and aunt). None of the adoptees is a particularly close match (the closest is a predicted 3rd to 5th cousin), so I'm unlikely to be able to help any of them identify their biological families at this stage. However, I thought this would be a good way to keep track of them, so that when my chromosome map of ancestors is more complete, I'll be in a better position to give pointers of either family names or geographical locations where adoptees and others looking for their biological families may find the answers they are looking for.