No, it's not Twitter's new advertising platform.
When the new platform is launched, you'll start noticing the ability to Tweet from some of the web's most trafficked sites. Of course, sites can already implement this technology. In fact, you can Tweet directly from the likes of AOL.com and the new MSN.com. So what's new?
It will launch with a dozen big brand partners. So don't get your copy and paste finger action ready yet. In the meantime, if you want a similar feature - just go ahead and use that API!
Image via official Twitter blog