DETERMINING LOGICAL GROUPS BASED ON BOTH PASSIVE AND ACTIVE ACTIVITIES OF USER

Systems and methods for adding a first user to a first group of users are presented. First, logical relationship information describing logical relationships among a plurality of users is accessed. Then potential membership of a first user in a first group of users is determined based on the logical relationship information, by selecting the first group from a plurality of possible groups, the selecting being based on scores generated, for each of the plurality of possible groups, by a candidate scorer module, the scores based at least partially on both passive and active interactions between the first user and other users, the first group of users containing a plurality of users, including one or more users who are not logically connected to the first user. Then the first user is added to the first group of users.