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Sorry, we don't allow usage of that endpoint in any other contexts than the Tweet Button. If the counts are important to display on your site, you'll either need to use the official Tweet Button or count the tweets yourself using the Streaming API and provide your own counts.

https://dev.twitter.com/discussions/5653

Is this new or undocumented or something? It just looks like a nice feature of Twitter's API, but not specially noteworthy. Care to elaborate?

I'm assuming this is how those "This has been Tweeted x times" buttons work. Also, it is not on the Twitter API 1.1 documentation, so this is almost definitely undocumented.

this api is used from twitter for counter on tweet buttons. You can check from firebug console. They say that we should not use this api because the counter sometimes was not correct, which is lie. I think that they dont wanna use this api because of overloading...

This feature is nothing special, is it?

Tweet counter