Social networks in the past have rarely been developed very. "People can be if they are not social networking, but for which there is no social network, in effect making it difficult to communicate.
Social networks in the past, I have also been developed more. The former can exist without the social network. But no social networks it has made it difficult to communicate. Than the perception may be slow.
Social networks in the past has not developed much. Old people can live without the social network. But having no social network has made difficult to communicate.