Warren Buffett is the chairman of Berkshire Hathaway. Johannes EISELE / AFP via Getty Images Warren Buffett was a trailblazer in using media to build a business, Sahil Bloom says. The wealth guru said Buffett's letters and annual meeting helped to grow his and Berkshire's brands. Bloom spoke to Business Insider about meeting Buffett and why the shareholder gathering is special. Warren Buffett is a media master, and Berkshire Hathaway's shareholder weekend is one of a kind, says influencer and investor Sahil Bloom. The author of "The 5 Types of Wealth" and writer of "The Curiosity Chronicle" newsletter spoke to Business Insider's Theron Mohamed in Buffett's hometown of Omaha on Friday, ahead of Berkshire's annual meeting.…