“Travel content is about connecting content to travelers wherever, however and whenever they need it,” said Mark Henshall, a former Frommer’s editor and now content director at Propellernet, a UK-based digital agency. “Digital does that really well.” And, like newspapers and other forms of print media, traditional guidebooks are feeling the squeeze. According to Nielsen Bookscan, the nation’s retailers sold 7.97 million books in the adult non-fiction/travel category last year, a 19-percent drop from 2011 and a 27-percent drop from 2010. Presumably, some of those dwindling sales were mitigated by people downloading guidebook publishers’ digital content but the trend also speaks to larger demographic and societal shifts. From Wikivoyage to TripAdvisor to blogs by legions of amateur travel writers, alternative travel content is everywhere. “If you’re in your 20s or 30s, the first place you’re going to go for travel information is a social network, not a guidebook,” said Howard Blumenthal, who writes the Digital Insider blog. “With so many people contributing content, you don’t have to go to Fodor’s to get hotel information because there’s TripAdvisor and its competitors.” Get the full story at NBCNews.com Read also "BBC Worldwide sells Lonely Planet business at £80m loss" at BBC News