Abstract:The social network iS rising in recent years to encourage users to participate in the creation of content. information interaction, and it iS based on interest group for the characteristics of the Web2.0 platfonT1.and attract a large number of users, with the library integration as inevitable trend under digital environment. Private library in the development process 1acks of available social capital, SO its founder sees the library on the social network topic group development more seriously.Some also gained high popularity and attention. Its developm ent status and prospect are is more hopeful, but there also exist some problems.