Twitter Product Preview on Tweets
So I just saw the tweet below and was wondering, how does amazon get the extra information into the tweet?
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That's an expanded tweet. They have partnerships with various companies to display more detailed information from them. The actual update is still just the bit above from Ben and stops at the reply, favorite, etc. buttons. The stuff below is injected by Twitter.
This is also related to Twitter Cards which is available for only few web sites at the moment.
The goal is to have expanded tweet from trusted sites to give a better user experience (à la Facebook).