Abstract: A method and system for determining a custom personal identification number (PIN) for a user based on an ordered series of events are disclosed, comprising generating the custom PIN for the user based on a set of stored events of the user, each event associated with a point in time and authenticating the user responsive to receiving information that matches the custom PIN. A chronological order of a selected subset of events can be determined. A chronological identifier can be assigned representative of a position of the respective event in the determined chronological order. The custom PIN can be determined as an arrangement of the chronological identifiers. The selected subset of events can be presented to the user in the arranged order. The user can be authenticated responsive to determining that a received indication of a chronological arrangement matches the determined PIN.

Abstract: Technology related to an activity feed service is disclosed. In one example of the disclosed technology, a method can include receiving updates to activity streams, where a respective activity stream indicates an engagement of a respective user with applications executing on a respective client device connected to a network. The different activity streams associated with a particular user can be merged to generate a merged activity stream associated with the particular user. The different received activity streams can correspond to different respective client devices. The merged activity stream associated with the particular user can be transmitted over the network.

Abstract: Technology related to an activity feed service is disclosed. In one example of the disclosed technology, a method can include receiving updates to activity streams, where a respective activity stream indicates an engagement of a respective user with applications executing on a respective client device connected to a network. The different activity streams associated with a particular user can be merged to generate a merged activity stream associated with the particular user. The different received activity streams can correspond to different respective client devices. The merged activity stream associated with the particular user can be transmitted over the network.