Enter your search into the search bar on twitter.com. Click Advanced search , located underneath Search filters on the upper right of your results page, or click More options and then click Advanced search. Fill in the appropriate fields to refine your search results (see ... See More...How do you find people on Twitter?
Twitter Search. The fastest way to find someone on Twitter if you don't know his Twitter username is to go directly to the Twitter Search page (see Resources for direct link). When you type someone's name in the search field, and then click the "People" link in the left menu, a list of accounts most closely matching that name will appear.