Comment by shadylane

I can confirm this. Got a site with very low traffic and one with 138K sessions a month. These russian spam referral sites are all over the low traffic site but they barely appear on the high traffic one. Not sure why Google hasn't blocked these yet. The same domains (ilovevitaly.com, darodar.com, pricer.com etc.) have been referral spamming since at least mid December. In fact the range of domains doing this was so limited it was relatively easy to set up exclusion rules in GA. The only annoying thing is that the exclusions aren't retroactive.