As I previously wrote on Asiajin
There are conflicting views about the biggest network in Japan because of methodological differences (GREE has about 26 million registered users (Source: GREE), Facebook has 13.5 unique users (Source: Nielsen (2012), read the criticism of the methodology here , Mixi has 15 million monthly users (Source: Mixi), Twitter has about 23 million users (source: Comscore)
Although all these numbers point to a different winner, we can conclude that Twitter is #1 social media destination in Japan because, GREE’s numbers do not reflect active users, Facebook’s own database shows only 10 million registered users and several nationwide polls indicate that Twitter is more popular than Mixi. In our study which was conducted in March, 2012 we asked 1000 online panel members about which to name the social network that they used most often (single choice) and the results were as follow
Here is another figure that shows the findings in detail. Please note that the first graph is the user/nonuser ratio among the whole sample (N=1000), the second graph is the percentage of registered users of each network among the participants who reported using at least 1 social network (n=453), the third graph is the most used social network among the participants who reported using at least 1 social network (n=453).
Another study by Tribal Media House and Cross Media Inc. which was released at the end of February, 2012 surveyed a nationwide sample of 10715 people and asked them to list the social networks they were using (multiple choice). Here are the results
In our study which was conducted in March, 2012 we asked 1000 online panel members about which networks they use and how frequently they use these networks. Here are tre results