Today, MIXI, Inc. launched a new social networking service called mixi2 in Japan.
https://mixi.social/
MIXI, Inc. is a veteran social networking company that still operates mixi, an SNS launched in March 2003, and is also a game developer/publisher that created the hit Monster Strike.
https://en.wikipedia.org/wiki/Mixi
It is one of the latest Twitter-like social networking services, and aims to return to its roots and "deepen relationships with people you are connected to and want to connect with," featuring a chronological timeline based on followers, short message posts of 149.3 characters*1, public communities, events, and more. To use it, you need the official iPhone or Android app.
https://support.mixi.social/support/solutions/articles/154000212308
*1 This is a joke that when read in reverse in Japanese, it becomes Mi-Ku-Shi-i (the pronunciation of mixi).