The Social Web book is "An Introduction to Web 2.0 and its Online Communities". The first chapter of this book covers Web 2.0 technologies through
theory and examples; this is followed by chapters providing the building blocks of an online presence and information sharing (blogs, wikis, and more), along with sociological and psychological elements; and the final part of the book (comprising the last two chapters) gets to the key point by covering online communities and their marketing.
The book web site is at www.socialwebbook.com.