1. A method comprising: collecting, via a computing device, user activity data associated with an existing user account on a network; identifying, via the computing device, a pattern within said user activity data; determining, via the computing device, whether said pattern represents legitimate or abusive activity; training, via the computing device, a classifier to analyze a new account registration request based upon said pattern determination, said training comprising providing the classifier with activity information related to legitimate and abusive activity, said activity information is based upon said pattern determination; and applying, via the computing device, the classifier to the new account registration request in order to determine whether the new account registration is abusive.