Richard Barton is a former Microsoft executive and founder of online travel company Expedia, Inc., real-estate internet company Zillow, and job search engine and career community Glassdoor. Mr. Barton cut into the business of travel agents by giving consumers a way to see airline ticket prices with Expedia, the online travel agency he founded inside Microsoft. With Zillow, he rattled real estate agents by showing the market values of homes. And Glassdoor, a top employment site, revealed employee