TwitterCardTerms And Conditions
TwitterCard does not collect or store personal data collected from the websites it is placed on. TwitterCard collects click data in order to determine its own effectiveness and clickthrough ratios. TwitterCard will never sell this data, or make it available to third parties.
Basically you have nothing to worry about when putting TwitterCard on your website. If at any time TwitterCard begins to include statistics, it will be announced through TwitterCard.com and will be opt-in.
