Get yourself a Battlnet authenticator for extra layer of security.
Login to your battlenet account and add the authenticator from there.
EDIT: Do not logout from the game before you secure your account.
Threats of violence. We take these seriously and will alert the proper authorities.
Posts containing personal information about other players. This includes physical addresses, e-mail addresses, phone numbers, and inappropriate photos and/or videos.
Harassing or discriminatory language. This will not be tolerated.