1. An active social network system comprising: an interaction analyzer comprising circuitry that is configured to retrieve an in-game action history of players of a computer-implemented multiplayer game, and analyze in-game actions of the players within a predetermined time interval to identify from a plurality of in-game actions one or more completed social interaction loops, each completed social interaction loop comprising at least one reciprocating in-game interaction that is performed by one of the players in response to an earlier in-game interaction performed by another one of the players, wherein in-game actions forming part of the one or more completed social interaction loops form a non-exhaustive subset of the analyzed in-game actions; an active social network compiler comprising circuitry configured compile, based on identification of the one or more completed social interaction loops in the in-game action history of the players, an active social network of at least one player, and to determine one or more attributes of each respective active social network; a retention analysis module comprising circuitry configured to perform a retention analysis based at least in part on the active social network of the at least one player; and a retention recommendation module comprising circuitry configured to generate a retention recommendation based on the retention analysis.