Are we following the right practices to install filters on our websites? Of course, not. Most websites don’t use filters or they use them but in the wrong way. Here’s an infographic illustrating the right practices to filter spam from Google Analytics.
Filter analytics traffic wisely. Create a separate view in Analytics to filter Analytics traffic.
Google provides you an easy button to block known bots (eliminates 70 to 80 percent of your work).
Create a bad referrer filter. Track the bad referrers with a bad referrer filter.
Source: http://www.jointviews.com/blog/filter-spam-traffic-from-google-analytics/
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