Family Trees 2.0

A new crop of genealogy Web sites are designed to recharge the oldest social network in human history: the family

In January, Bob Warden of Santa Rosa, Calif., received a rare e-mail from his 25-year-old nephew Christian. A link in the message directed him to Geni.com, a social-networking site where Christian had assembled a virtual family tree with names, pictures, birth dates, and e-mail addresses of the Warden clan, mapped out in pink and blue boxes. But Uncle Bob's help was needed: The tree was missing generations of aunts and uncles, cousins, and great-grandparents. Five months later, Uncle Bob's office is cluttered with cardboard boxes of old family photos and letters, and there are 538 relatives on the Warden family's Geni tree.

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