Twitter has a built-in search function, which performs well at finding Twitter posts in real time. But to dig into Twitter’s archive to see how a story or event evolved over time on the service, the built-in search feature sometimes falls short.
Google now has a tool that allows you to search Twitter and visualize activity on the network. To do so, plug the search query into the regular Google search, click the “Show options” link in the blue bar on the results page, then select “Updates”.
The resulting page will display all of the tweets with your search term and a graph that shows the number of Twitter posts with your term over time.