Definitive Guide to Removing All Google Analytics Spam http://help.analyticsedge.com/spam-filter/definitive-guide-to-removing-google-analytics-spam/
Google analytics shows traffic from sharebutton.to
The most effective solution is a valid hostname filter as described by StevieD_Web, but note that there are also some crawlers that get past this defense, so you would also need additional filters to get a clean report.
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