Now you can do the banning you wish Google would do.

That works about as straightforwardly as you’d expect — once installed, you’ll simply see a link to block a site along with each search result, and you’ll also be able to unblock sites at any time if you go a bit overboard. What’s most interesting, however, is that Google says it’s going to study the feedback it gets from extension and that it will consider using it as a potential ranking signal for its search results.

The following passage reinforces my belief that Google is Twitter’s best suitor:

Twitter Search will be used to crawl information from links by Twitters to analyze and then index the content for future use, [Santosh] Jayaram, a former vice president for search quality at Google, told Webware. Currently Twitter Search is only used to search words included in tweets, but not words in links.

Along with its new crawling functionality, Twitter Search will also get a ranking system. When users do a search on trending topics — the top-10 topics people tweet about, which get their own link on the Twitter sidebar — Twitter will analyze the reputation of the tweet writer and rank search results partially based on that.

Sound familiar?

Twitter search is its killer app because it provides instant gratification in a way Google doesn’t. Twitter excels at breaking news and developing trends. Google excels at cataloging everything else. Put them together and you’ve got an extremely powerful search tool.

The following paragraph illustrates the power and value of Twitter:

But taken collectively, the stream of messages can turn Twitter into a surprisingly useful tool for solving problems and providing insights into the digital mood. By tapping into the world’s collective brain, researchers of all kinds have found that if they make the effort to dig through the mundane comments, the live conversations offer an early glimpse into public sentiment — and even help them shape it.