sharethis.com when blocked concrete5 loops until page is closed

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We are using websense to control web traffic, and we are using concrete5 for our intranet and internal blog. Users that have restricted internet access have 100,000+ hits for sharethis.com when parking their browser on our intranet site. When less restricted users access the site they don't get the constant attempts to access sharethis.com Does anyone know exactly how to turn this behavior off while maintaining the web access restriction?