Earlier quoted context omitted.
This is an interesting idea that I haven't seen before. Why shouldn't Twitter target trends at me? They know my tweets, and tweets of the people I follow. They could target trends, and ads for that matter, that I'd actually like to see.
Maybe they don't want to get into the targeted advertising market and see themselves more as general advertising? That said, you still don't see ads for women's lingerie during the World Series and you don't see many beer ads during Dancing with the Stars. There's a balance and I don't think twitter has it figured out yet.
Then I think they completely missed the boat.
The whole conceit of twitter is _you decide_ who to follow. They don't even start you out with a Myspace-esque Tom. Every user's timeline is unique.
So, if I'm following Roger Ebert, Kevin Smith, and Netflix, don't you think I would be receptive to DVD advertisements? Similarly, if I'm following Pogue, Mossberg, and Gruber, wouldn't I be receptive to iPhone app ads?