Learn how to use Twitter's search to engage with prospects. Go to http://twitter.com/search, and use these advanced search operators:
Use near:"city" to find local results (e.g., restaurant near:"Milwaukee" or near:"Chicao, IL"). Use within:25mi, for example, to narrow down your search range by distance, in miles, to the city you've selected. Use -http (minus sign http) to make sure that none of the tweets contain links. Use ? (question mark) to display tweets with a question.
Use "search phrase" (in quotation marks) to search for an exact phrase.
Savvy Twitter Search