Here is a tool that could help marketing a lot although it appears you will have to weigh the cost to benefit. Social media utilization and history research
Excerpt: All of that said, whether lots of Twitter buzz translates to actual sales or market movement is still a point of contention between marketers and analysts — especially in the still-nascent days of brands and Big Media figuring out how to most effectively use platforms like Twitter, Facebook and Foursquare to reach consumers.
At the very least, Gnip’s new offering means you won’t have to resort to thumbing the Dewey Decimal cards of the Library of Congress the next time you’re trying to gain access to one of your long-since-tweeted messages. Just be prepared to cough up some green.