Two sets of questions:
Do you have to add code to each new story for which you would like to have a Twitter Card associated? Or, is it instead possible to designate all stories on a website, or all on a section of website, at one time for Twitter Card association?
If a publisher participates in Twitter Cards, would Twitter have the permission or ability to pull user/usage data from that publisher’s website?
Apologies if these are naive-sounding questions! I’m a non-techie.