Referrer Spam Blocker lets you automatically install filters to block referral spam in Google Analytics. You can install filters to block any future spam, or you can use segments to view your current Google Analytics data without spam. From the website: How does this work? We use the Google Analtyics API to automate the process of installing filters to your Google Analytics account. No technical knowledge required. Filter both ghost traffic and spam crawlers. Install filters for all your domains at once. Real-time updates on our blacklist via Twitter. And it's completely free.

This looks excellent in principle, but when I tried to use it, it got stuck on authenticated my account. Another excellent service like this: https://www.quantable.com/analyt...

I love anything that reduces spam -- thank the laaaaaaaawd for this