Through the NAJ Group, an unprecedented, first-ever gathering of leaders from the major companies in the world of the Internet - Facebook, Groupon, Twitter, TripAdvisor, LinkedIn, Pandora, Yelp! and others - will descend upon the upcoming 12th annual E-Tourism Summit Sept. 29th-30th at the Hotel Nikko in San Francisco, making the event unique in the intersecting worlds of e-commerce and the travel and tourism industry.