Also, Wayfair hasn't seen a huge appreciation and TripAdvisor has been around since 2000 (admittedly, Yelp was founded in 2004). And HubSpot and Wayfair are based in Boston, and have been relatively underhyped.

Facebook, however, has been demonstrably successful since going public, despite the massive SV hype. Zuckerberg and his team deserve full credit for delivering on a successful mobile monetization strategy and making some great acquisitions (particularly Instagram, given its acquisition price and its estimated valuation now.)