About to start exploring cards but had a quick question. The page I want to enable for Tweeting is dynamic (updated every couple of minutes, searchable, sortable). I intend to create a custom jpg (et al) of the page on-the-fly so that a given user’s Tweet will be personalized to what they are actually seeing.
BUT, I don’t want to be in the image hosting business. When a user tweets a page with an a card image, does Twitter scrape and persist it in its image DB (such that I could eg delete it after 24 hours), or does it store the URL of the image and constantly pull it (such that I have to persist it indefinitely)?