How does Streak work? Is it a browser add on I need to install or does Google let developers create their own hacks? Btw, you should also consider putting up ad

How does Streak work? Is it a browser add on I need to install or does Google let developers create their own hacks? Btw, you should also consider putting up ads of Steak on your website. I misread Streak for Steak, and have been craving for some medium rare steak. I wonder if Streak.com could become the Amazon of steak delivery.