Patent ID: 8844031

Claim:
A method comprising, by one or more computing devices: accessing event information associated with a first event listing of an online event management system, wherein the online event management system is operable to register one or more attendees for an event corresponding to the first event listing, and wherein the event is associated with a first event organizer account; accessing information identifying one or more remote hosts associated with the first event organizer account, each remote host being external to the online event management system; identifying one or more second event organizer accounts based on the one or more identified remote hosts, wherein each of the identified second event organizer accounts is associated with at least one of the remote hosts associated with the first event organizer account; and calculating by a spam-detection model a spam risk score for the first event listing based at least in part on a pattern of behavior associated with the first event organizer account and the one or more second event organizer accounts.