Community Networks versus Social Networks

Google (GOOG) has just bought Jaiku, a Finland-based mobile IM and presence company.
In the recent period many articles has touched upon sites like Jaiku, FaceBook, and LinkedIn etc and labeled them "social networks". But in my opinion they can't be classified as social network, but more as "free end-user driven virtual community networks" as real contact between members are rare.

Real social networks are a description of a "professional real life and closed company specific social networks" where real contacts between members are what the software displays and analyse on.

lars-kirstein.blogspot.com