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Under what circumstances do normal URL-links (without image upload) in a Tweet automatically convert into an autoexpanded image/link-combination?
For example: Links to some newspaper articles show as link only while others convert into some kind of clickable thumbnail of the article itself.
This is related to a feature called Twitter Cards. After the site owner inserts specific meta tags to the page and validates it via Twitter, a Twitter Card will be displayed in addition to the link. There are various card types for different types of content.
I made an app for this after getting frustrated that Twitter didn't do it automatically. If you're still trying to, you can just use http://jpg.party/SOME_IMAGE_URL and Twitter will make a card for you.
