Although HTTPS has brought technological and security advancements for webmasters including SEO value, there are some downsides. Marketers are increasingly becoming aware that moving from HTTP to HTTPS has caused a loss in referral data. So what exactly is this data? How does it affect your company? We will walk you through what HTTPS is, what changes to expect, and how to effectively use referrer tags to control how much data your HTTPS site wishes to share.