Twitter kicks off promoted tweets

So, Twitter launched the advertising platform this week. Companies like Starbucks and Virgin have signed up for the service straights away. I noticed these three today:

 I find it quite weird. It is a form of advertising, no doubt about it, but why when I click on the "Promoted by XY" ,just below the particular tweet, it takes to me to "FAQ: Promoted Tweets". Shouldn't it take me to the brand's home website? I am the target audience, not a potential advertiser...