Looks all nice and such but the family member role at the time of the sign up, seems limiting. What if your family is small based on the available relationship in the dropdown? You wouldn't bother creating a new social network just for one or two people. If the "family incharge" (as per your FAQ) can possibly extend the family he/she creates later on, than I think it should be identified first.<p>I think ultimately, the emphasis on the private nature of all of these social networks has one single limitation issue: the building of network requires few people taking initiative of building the network (which you have identified as "family administrator"). Without such people taking initiative, these networks don't really go anywhere. And we know that not everyone takes those initiatives, especially when the site is brand new, unknown and/or not so popular.<p>Just some thoughts.