Avatar Mobility in Networked Virtual Environments: Measurements,   Analysis, and Implications
  We collected mobility traces of 84,208 avatars spanning 22 regions over two months in Second Life, a popular networked virtual environment. We analyzed the traces to characterize the dynamics of the avatars mobility and behavior, both temporally and spatially. We discuss the implications of the our findings to the design of peer-to-peer networked virtual environments, interest management, mobility modeling of avatars, server load balancing and zone partitioning, client-side caching, and prefetching. 
Huiguang Liang, Ian Tay, Ming Feng Neo, Wei Tsang Ooi, Mehul Motani