This is a 60 day time lapse animation of a subset of a large (40,000+ active member) social network. New users (egos) are coded as red squares and enter the network on days 21-28. The day is reflected in the top left corner as "slice" number. The existing users that they come into contact with are coded as blue circles. In the case of this network, the links (blue lines) are reciprocated email communications within the system's private mail system.