Since Wikipedia was launched online in 2001 as "the free encyclopedia that anyone can edit," it has blossomed to more than a billion words spread over 10 million articles in 250 languages, including 2.5 million articles in English, according to Wikipedia cofounder Wales in the foreword. Lih, a Beijing-based commentator on new media and technology for NPR and CNN, researched Wikipedia and collaborative journalism as a University of Hong Kong academic, and he has been a participating "Wikipedian" himself for the past five years. He notes the site has "invigorated and disrupted the world of encyclopedias... yet only a fraction of the public who use Wikipedia realize it is entirely created by legions of unpaid and often unidentified volunteers." Other books have surfaced (How Wikipedia Works; Wikinomics), but Lih's authoritative approach covers much more, from the influence of Ayn Rand on Wikipedia cofounder Jimmy Wales and the "burnout and stress" of highly active volunteer editor-writers to controversies, credibility crises and vandalism.