Spreadable comes built in with a few different security tools to keep your referral program safe: The first is a Captcha on all overlays and referral pages that is designed to stop automated bots and spammers. The second is what we call IP throttling, which only allows a set number of referrals to be sent from a certain IP address over a given time period. The third precaution taken to protect your safety is our own Blacklist of known spammers that are prevented from sending ANY referrals from a Spreadable widget.