Human dynamic model co-driven by interest and social identity in the MicroBlog community

► We study human behavior on MicroBlog and extend it to a mobile Internet context. ► The intervals between information release and comment follow a power law. ► We establish a human dynamic model co-driven by interest and social identity. ► Messaging intervals are influenced by how much one user's interest declines. ► Social identity will slow down the decline of users' interest.