You can try blocking them in .htaccess, but that won't have any effect on the ones which are not even visiting your site. Read this article below to see how these referrers are appearing in your GA stats without actually visiting you:
[Updated] darodar.com referrer spam and should you be worried? - blackMORE Ops
This quote from the article above pretty much sums it up (example using darodar.com):
Quote:
1. darodar.com is using your Google Analytics Code to recreate fake information and sending that directly to Google Analytics.
2. They are not visiting your website.
3. In this case, they are possibly using a script to randomly create Google Analytics code UA-xXxXxXxX-1. Some would work, some wont.
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You can set up a filter to remove these types of referrals from your stats in GA. Other than that, there isn't that much you can do about them.