I think it should be prominently displayed on your home page or pin it to your social media account to warn others about this,could damage the company's reputation it's not only bitmain but all other big company are being victimized..
Social media is also a good idea. But i think to give a personal email to everyone regarding this. I think that reaching through facebook, twitter may left ouy some guys, so its better to give an email to everyone making it sure that all are aware.