Genealogy continues to evolve into new areas in the ever-broading scope of the field. Quoting from the website's homepage . . .
"Familybuilder is a leading software application development company focused on building genealogy and family-oriented applications within online social networks. The company’s flagship product, Family Tree, is a leading social genealogy application on Facebook, Bebo, and MySpace. As of April 1, 2008 over 10,000,000 profiles have been built with Familybuilder."
Yet another of many ways to try and locate other living descendants who may be of help in finding those 'missing' ancestors.