Path, FamilyLeaf and Pair, Small-by-Design Social Networks - NYTimes.com: "Newer social networks, like Path, FamilyLeaf and Pair, offer a range of constraints. A Path network, available only on smartphones, has a maximum of 150 friends. FamilyLeaf is restricted to family members. And Pair, which like Path is for smartphones only, is as small as a social network can be: just one other person.
The average Facebook user in United States has 245 friends, according to a study published in February by the Internet and American Life Project of the Pew Research Center. That figure, however, well exceeds the “Dunbar number,” the 150 meaningful relationships that Robin Dunbar, an anthropologist, has suggested is the effective neurological limit the human brain can handle."
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