1. A method for using account login information, comprising: determining at least one potentially or actually compromised account using at least one computer; determining actual user login information associated with the at least one potentially or actually compromised account using stored login information usage data associated with the at least one potentially or actually compromised account; determining at least one other account having similar login information by tracking usage data of the actual user login information, wherein tracking usage data comprises searching for additional accounts that have login information that is identical to or a derivative of the actual user login information associated with the at least one potentially or actually compromised account and searching for additional accounts that have login information that is a derivative of the actual user login information associated with the at least one potentially or actually compromised account; and notifying a user regarding a threat to the at least one other account, wherein the user notification comprises at least one of prompting the user to change the actual user login information, prompting the user to remove sensitive information from the at least one other account, and informing corresponding websites of compromised accounts.