The ted.com twitter widget?

On all the videos on ted, there is a widget thing with an inputfield that says tweet this (we'll add the url later) you put stuff in a box, it get's a tiny-url and get's pushed to facebook.

I'm trying to figure out what it's called. Does anyone have a clue?

example: http://www.ted.com/talks/dan_phillips_creative_houses_from_reclaimed_开发者_StackOverflow社区stuff.html

Looks like they are using the service provided by AddThis. Looking at their site, they offer some stock sharing links, but also have an API for creating more advanced ones.