In recent years, application of Social Networking Services (SNS) and Blogs are growing as
new communication tools on the Internet. Several large-scale SNS sites are prospering;
meanwhile, many sites with relatively small scale are offering services. Such small-scale
SNSs realize small-group isolated type of communication while neither mixi nor MySpace
can do that. However, the studies on SNS are almost about particular large-scale SNSs and
cannot analyze whether their results apply for general features or for special characteristics …