There are a lot of blog posts aiding people to get rid of referrer spam in Google Analytics and although they are effective, the spammers are usually one step ahead of you, and spam will find its way in your data.
How serious is the problem?
It varies depending if you have a lot or a little traffic and whether spammers are targeting your site or if it is a random attack.
I wanted to find out how serious the problem was for some of the sites I manage, and here is what I found out using our growth dashboard:
Before removing the spam:
After removing Spam:
So, for this site 1% of the monthly growth is caused by spam…Not good right?
Ok, so how did I do that? Lets go through the steps and the new dashboard.