Indeed. See this: http://godplaysdice.blogspot.com/2009/12/uniquely-identifying-people-by-birth.html http://godplaysdice.blogspot.com/2009/12/uniquely-identify

Indeed. See this: http://godplaysdice.blogspot.com/2009/12/uniquely-identifying-people-by-birth.html http://godplaysdice.blogspot.com/2009/12/uniquely-identifyin... I imagine gender and DoB factor in heavily to something like a recommendation engine, and I'm sure zip code would come into play when trying to get those last couple percent as is the case with the Netflix prizes.