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With the viral success of family tree sites like Geni, it was inevitable that others would pile in. The latest to join the family is Genoom, a very similar - if a little prettier - take on the same idea.
You start by adding yourself to a family tree, then add brothers, sisters, daughters, sons and so on to extend the diagram. Add the email address of those people and they get invited too, helping to extend your tree and gaining lots more users for Genoom.