1. A computer-implemented method to manage interactions between users of different user classifications in an online environment, the computer-implemented method comprising: determining a first user classification to assign to a first user of a plurality of users in the online environment, by operation of one or more computer processors and based on: (i) an activity type preferred by the first user; (ii) an activity chat frequency exhibited by the first user; and (iii) an activity skill level exhibited by the first user; assigning the first user classification to the first user; monitoring interactions between the plurality of users in the online environment; determining, based on the monitored interactions and at a first point in time, a first set of expressions satisfying a recent usage frequency by users assigned the first user classification, each expression comprising a respective chat message, whereafter only the first set of expressions is conveyed as being selectable by the first user to send to other users of the online environment; responsive to a selection of a first expression of the first set of expressions by the first user, sending the first expression to a specified, second user of the plurality of users without requiring the first user to compose the first expression; and determining, based on the monitored interactions and at a second point in time subsequent to the first point in time, a second set of expressions satisfying the recent usage frequency by users assigned the first user classification, wherein the second set of expressions is distinct from the first set of expressions, whereafter only the second set of expressions is conveyed as being selectable by the second user to send to other users of the online environment; wherein distinct sets of expressions are conveyed to the first user for selection as usage of expressions, by users assigned the first user classification, evolves over time.