Zappos CEO Tony Hsieh believes many companies miss the boat when it comes to building their brands. They tend to focus on what they want people to believe about their company. The better approach, Hsieh told DIGIDAY at the South by Southwest Interactive this week, is to focus internally. A brand is a “lagging indicator” of a company’s culture, he said. That lag is getting shorter than ever thanks to social media, Hsieh added.