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  • Age
  • Title
    Co-Founder and CEO
  • Company

Part online business directory, part customer reviews hub, Yelp has become indispensable for 108 million active monthly users since ex-PayPalers Stoppelman and Russel Simmons started it in 2004. This year it took the concept further with Yelp Platform, letting users buy meals from restaurants directly on Yelp (Stoppelman says services will follow). But plain old advertising is expected to power revenue for the company in the years to come: Sales jumped 69% to $55 million last quarter, trumping Wall Street’s expectations (see the feature story on Yelp).