Please add the functionality of some sort of Captcha to verify that a registration is being completed by a human and not a bot. I just received 5500 registrations to a webinar in a 10 minute span and that is unacceptable. The time I now have to spend cleaning this administrative mess up, not only from Gotowebinar but also from my email is risiculous and so unnecessary. It is not a complex feature to add. Please get it added.