One of the biggest differences between mixi and Facebook is that on mixi the trend is to stay relatively anonymous, i.e. with a nickname that your friends would

One of the biggest differences between mixi and Facebook is that on mixi the trend is to stay relatively anonymous, i.e. with a nickname that your friends would recognize but someone googling your name would miss. It's possible that this might have an effect on facebooks uptake in Japan. Also, an easy way to link your mixi account would be an obvious way to get people to cross over.