A Japanese SNS website. Sorta like a Japanese version of myspace
. One can only become a user via invitation from another mixi user.
It has been a problem where certain jocks will post about how bad they were, such as stealing motorcycles, which will then attract hundreds of angry users and start up a flame war. This will eventually lead to the exposure of the user, giving out his real name and his past crime to his school/employer, which is equal to a death sentence in Japan.