I have some more ideas to improve this plugin:
Add an option to add our own sites to the block list, and as well an ability to export this list and import it on another site.
Let me know what you think about it 🙂
FYI More sites that you can add to your block list:
Referrers Sessions
4webmasters.org 385
trafficmonetize.org 271
guardlink.org 119
sanjosestartups.com 19
howtostopreferralspam.eu 16
www1.free-social-buttons.com 10
www4.free-social-buttons.com 10
http://www.Get-Free-Traffic-Now.com 10
This site has a list (scroll down a bit) of many more referral spammmers, which you may want to include: http://www.partnerincontent.nl/web-analytics/google-analytics-referral-spam-blokkeren-verwijderen/
I have installed this plugin on a dozen of sites I manage. Thanks a lot for creating this. I really hope the referral spam stays away from now on 🙂
