Came across this incredible site with an easy guide to removing spam and other junk from google analytics. I was trying to find out what referrals like perform-like-alibabaity.info and free-seo-help.org were. I discovered that these are referral spam.
Carlos Escalera breaks down everything with an easy-to-follow tutorial on generating filters and cleaning historical data. Moreover, he has other great SEO and analytics articles; making this is a great reference for managing your site.
Here are the links:
Start off with this one for removing junk traffic from analytics:
The Ultimate Guide to Stopping Google Analytics Spam, Bots and Other Junk Traffic
Here’s the main site:
CarloSEO – The perfect equation for your website success