Last months I have lots of referrer spammers in my GA statistics. Their count is ~10x higher than count of legit visitors (my site is not very popular yet). I've turned on an option to hide known spammers in GA settings, but it didn't help at all. It seems these spammers are using scripts to spam directly to GA (i.e. they are not logged in my IIS).
Is there anything I can do to stop these spammers?
UPD 10 months later, and they started spamming using fake target page names... and Google is still doing nothing about it.
