Because Twitter does not allow Google's alogrithmic crawlers full access to the Twitter.com domain, the feature does not include content from Twitter. (Google used to pay for this privelege, but it stopped over the summer.)
So let me get this straight -- Google honored their agreement with Twitter, honored Twitter's "no crawling" rule, and for this, Twitter is upset?
You can't have it both ways, guys... you can't keep Google out and then get mad when they were, in fact, kept out.
Ok, I realize how big Twitter and how news always breaks there first, but I HATE twitter. I am so sick and tired of all that stupid hashtag crap. Especially when i'm reading an article and I want to read through the comments, and all you see are stupid hashtag comments with the name of the story behind it. They plague my facebook page for some stupid reason, and they're just all over the place. DIE TWITTER! DIE!!!!!!!