The document summarizes findings from in-depth interviews with mobile social network service (SNS) users in China. It finds that SNS platforms like Kaixin and Xiaonei are used for non-instant communication with acquaintances, unlike instant messaging with close friends. Games and activities are very engaging for many Kaixin users. Mobile SNS usage includes quick tasks and killing time. The initial Kaixin mobile client was disappointing to users because popular games were missing and it mostly redirected to the mobile website.