Muhammad Yasin began heading up social media marketing at Indianapolis-based HCC Medical Insurance Services LLC in early 2011. The company, which sells travel insurance and short-term medical insurance online, credits his work with tripling overall revenue in 2011 to more than $60 million and growing even more this year. Yasin, along with a steady stream of interns, manages nearly 50 social media accounts on Facebook, Twitter, Pinterest and YouTube, and has about 400,000 total followers. Collectively, HCC’s social media team produces 2,000 pieces of “content” every month—even though it operates in a highly regulated industry.