Zillow CEO Rich Barton reportedly just became a billionaire. Meet the serial entrepreneur who also founded Expedia and Glassdoor.

· Rich Barton, the founder and CEO of Zillow, became a billionaire after the homebuying site stock surged on a strong earnings report on February 20.
· Barton led Zillow — which is best known for its suite of real-estate websites including Trulia, HotPads, Naked Apartments, and Streeteasy — to expand into buying users'...