How to add Twitter Expanded Tweets? (was: twitter media preview card for my site?)

StackOverflow https://stackoverflow.com/questions/7419644

  •  30-10-2019
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Question

I googled a lot about how to make twitter media preview for my website entities if they are linked in a tweet like images below:

YouTube example

Kickstarter example

Any idea where can I find some documentation about it? Or a tutorial? Is this possible or these media/site previews are hardcoded in twitter?

EDIT:

so, what I need: If someone links my site on twitter, my widget appear under the tweet, like below:

Example example

UPDATE 2012-06-13

It appears this is an Expanded Tweet - -what the requirements are to integrate these expansions into Twitter are do not appear to be displayed - but this sure is interesting.

No correct solution

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