A Small World

Opposite to Facebook, A Small World is a very secret social network which only offers the membership for those people who are invited by the current members. Normally, people try to make their social network bigger and bigger so they are willing to accept any friend request.

However, when time goes by, they will find out that a lot of "friends" on the list are not familiar or haven't contact with for a long time. In fact, people only establish a strong network with some of their friends. Based on the idea, A Small World provides a very private and closed network, which actually grap the attention because of its unique policy.

http://www.asmallworld.net

Currently I can't get into this network because I don't have any friend inside (Or I have but I just don't know that).