Next time there's breaking news in your neighborhood (like an earthquake) try your search on Google and on Search.Twitter.com and see which has the news faster. Twitter is instant. Google has to wait for someone to publish an article on the news and then Google needs to index that article. Plus with Google, the article's headline doesn't give you the whole story. It's a tease. You have to click over to read the story…
http://www.google.com/search?q=earthquake+san+francisco
the most recent earthquake it tells me about is 3 hours ago (as of this writing).
The time, place and links to maps are all right there at the top of the serp where I expect.
If I do the same query on twitter:
http://search.twitter.com/search?q=earthquake+san+francisco
The most recent result is 19 hours old and then I have to start clicking tinyurls in people's tweets to find more info.