1. Tips for removing referral spam before it happens. Some of the recommendations may make you uncomfortable if you aren't super savvy on editing your .htaccess file.
  2. Create an advanced segment in Google Analytics to back out crawlers and ghost referrals from historical reports.
  3. In addition to discussing some of the issues addressed in the Raven.com post mentioned above, this post also addresses three specific SPAM referrers and their reasons for spamming.
  4. Here's a guide that helps you create a filtered view in your Google Analytics account. This will help you filter out future "bad" traffic. You will still need that advanced segment (see article above on creating an advanced segment) to back out historical bad data.
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