How to Block Spam Referrers like darodar.com from Accessing Website?

Question

I have several websites that get daily around 5% of visits from spam referrers. There is one strange things I noticed about this referrers: they show in Google Analytics, bu

Answer 1

I think that the most effective way to avoid ghost spam is to add a custom dimension that let you know the site was indeed visited, because as we know they never visit the site.

ga('set', 'dimension1', "Hey I'm really here!!");
ga('send', 'pageview');

You should simply add this lines in your pages and then add a filter to "include" only when the dimension has the expected value ("Hey I'm really here!!") in this case

Answer 2

According to this entry, they are never visiting your site, they are faking HTTP request to GA using your UA-code. So, it seems it's pointless to block them using .htaccess or any other method, because they never actually enter to your site, they are only sending fake "visit" data to Google.