Posted by jaredgardner This post was originally in YouMoz , and was promoted to the main blog because it provides great value and interest to our community. The author's views are entirely his or her own and may not reflect the views of Moz, Inc. A few months back, my agency started seeing a referral traffic spike in our Google Analytics account. At first, I got excited. Someone is linking to us and people are clicking. Hooray! Wrong! How very, very wrong. As I dug deeper, I saw that most of this referral traffic was sent from spammers, and mostly from one spammer named Vitaly Popov (or, as I like to call him, “the most recent pain in my ass”). The domains he owns have been giving our company’s site and most of our clients’ sites a few hundred sessions per month, enough to throw off the analytics data in many cases. His sites aren’t the only ones I’ll cover in this how-to, but his spam network has been the biggest nuisance lately. If you’re getting spam referrers in your a...