Reading now: UContent

UContent: The Information Professional's Guide to User-Generated Content, By Nicholas G. Tomaiuolo, Information Today, Inc. (2012), ISBN-13: 978-1573874250.

Extract from PREFACE:
"For librarians who want a shortcut guide to what it means to be a participant in these [e.g., Flickr, Wikipedia] and many more community sites, UContent provides a quick introduction to the practical ins and outs of participating, as well as how libraries are using these services and projects. Understanding the web and the many resources it offers our patrons (many of them created by their peers) is certainly a core job of the information professional, and UContent helps provide an orientation in a confusing, buzzword-y space. All libraries are situated within communities of participation in real life—within schools, research labs, or cities—and the internet is no different. The question is: Where will you participate?"
—Phoebe Ayers, librarian, University of California, co-author of How Wikipedia Works, and Davis trustee, Wikimedia Foundation [source]

What others say:

A thorough and thoughtful guide to Web 2.0, providing historical background on user-generated content and a field guide to Web 2.0 applications... --Ron Gilmour, natural sciences librarian, Ithaca College
... A fun book to read, it is worth the time of any librarian who wants to exploit Web 2.0 technology. --Eric Lease Morgan, digital projects librarian, University of Notre Dame.

Contents: Chapter 1: The Evolution of UContent, Chapter 2: Project Gutenberg, Chapter 3: Blogs, Chapter 4: Wikis, Chapter 5: Podcasts, Slides, Screencasts and Video, Chapter 6: Facebook, Chapter 7: Online Reviews of Products and Services, Chapter 8: Self-Publishing, Chapter 9: Citizen Journalism, Chapter 10: Tagging, Folksonomies and Social Bookmarking, Chapter 11: Custom Search Engines, Chapter 12: Cybercartography, Chapter 13: Yahoo! Pipes, Chapter 14: Flickr

Bottomline:
What is user generated content (in short, UGC or U-Content): ..."the production of content by the general public rather than by paid professionals and experts in the field." (p. 4)

Is this book about: a) Content added to websites, or b) content added to library's resources (OPAC, Blog, etc)?
The answer is, obvious from the Contents of the book (as listed above), the book is by and large about the Content added to websites. And, the context is equally divided by contributions by end-users on the Web, and library/librarians.

PS. Individuals interested in the controversy over the validity and reliability of user-generated content (UGC) may get a glimpse from the author's U-Content: Project Gutenberg, Me, and You.