Google's fucked. Searched for "Matt Cain" and got a Wikipedia article. Searched Twitter and found a link to live coverage and saw it.
Lucas Meadows stashed this in Twitter!
What if you want to find that tweet a week from now?
Seriously. Twitter search blows. It beats Google only for things that are happening right now.
Search for "Matt Cain" later and you find great links on Google to Matt Cain's perfect game.
Search for Matt Cain on Twitter now and you get a few useful links dispersed among a bunch of garbage tweets.
As we get further from something actually happening, Twitter becomes increasingly irrelevant.