What is referral spam in Google Analytics

What is Referral Spam and How to Recognize it in Google Analytics ?

Few weeks ago, one of my clients started seeing spike in referral traffic in Google Analytics. Of course he got excited, thinking that his website is getting popular, people are linking and visitors are coming. Unfortunately that wasn`t true. You don`t have to be a Google Analytics expert to see that all the¬†traffic my client[…]