Piwik\Plugins\Referrers\Referrers::addReportToInsightsOverview PHP Method

    public function addReportToInsightsOverview(&$reports)
    {
        $reports['Referrers_getWebsites'] = array();
        $reports['Referrers_getCampaigns'] = array();
        $reports['Referrers_getSocials'] = array();
        $reports['Referrers_getSearchEngines'] = array();
    }