"Taken together, search engines made almost 98% of all referrals, while social networking sites made up just 0.55%. Top Referring Website Categories Worldwide, September 2009 (thousands and % share) Twitter in particular—despite the hype—was low on referrals, and falling. In July, Twitter was No. 24 on Chitika’s list of top referrers, with 0.05%. By September, it had moved down to 44th place, with just a 0.02% share."