I guess it's different if you have a large extended family. Personally, the extended family on my mother's side keeps a directory (she had a large family) of em

I guess it's different if you have a large extended family. Personally, the extended family on my mother's side keeps a directory (she had a large family) of email + phone + address for all of the aunts, uncles, cousins, etc. Someone just updates it once a year. I can see people relying on Facebook to keep track of this rather than needing to have someone manually manage it. On the other hand, since it's family, you can just call someone you do have the number for, and work your way through the chain to get to someone that has the correct info.