Encouraging player socialization using a nemesis and avenger system

A non-transitory computer-readable storage medium storing one or more instructions which, when executed by one or more processors, cause the one or more processors to perform steps comprising:

• in response to a player explicitly indicating that a set of other players are friends, constructing a friends list, associated with a first account of the player, that identifies a set of accounts that correspond to the set of other players;
• detecting that a particular event has occurred within a first game instance;
• wherein the particular event involves:
• first one or more player characters that are controllable by a first account, and
• a particular computer-controlled character,
• in response to detecting that the particular event has occurred, performing steps of:
• retrieving the friends list associated with the first account,
• based on the friends list, determining the set of accounts that correspond to the set of other players,
• selecting, from among that set of accounts, a second account from one or more accounts based on a friends list associated with the first account, wherein the second account is a different account than the first account,
• wherein the second account is a different account than the first account,
• storing data associated with the second account that flags the second account to be invaded by one or more computer-controlled characters,
• based on the data that flags the second account, generating the one or more computer-controlled characters in a second game instance;
• wherein the second game instance includes second one or more player characters that are controllable by the second account.