A method and system for verifying authenticity of an online usage of a user may include sending a message in an electronic communication to an electronic message address of a user, interactively communicating with the user a request for a response including at least a portion of the message sent to the user, and determining if a response to the request from the user matches at least a portion of the message sent to the user. The message may include a personal identification number used for verification. A certification link or authentication code may be provided to the user for posting on a website or within an email. The certification link or authentication code, optionally displaying an indicia, may enable other users to have confidence that the user whose website other users access or whose emails other users receive are authentic and not someone impersonating the user.