I'm waiting for Facebook to acquire Ancestry.com and incorporate it into their overall infrastructure.<p>My parents have used Ancestry.com quite a lot, and I realized that what's being built there is a historical, online family network. That is, as you dig into your family's past to find ancestors, you will find records of people that others have made or added to. That, of course, means you have found other people you're related to. Incorporating that into the current largest online social network just seems so obvious to me that I'm surprised it hasn't happened yet.