Go Viral published a book called "The Social Metropolis" where and I quote "By visiting the Social Metropolis you will learn about the evolution of people, media, and technology.
In addition, you will gain insights into the trends that are shaping the future, understand the key challenges, and tackle issues that so far have gone unaddressed. In short, you will learn how to navigate the Social Metropolis."
It’s a book full of really nice ideas, concepts and cases in order to give you an overview of how the people interact with the possibilities and technologies of the net, so if you got some time it’s a must reader. You can have a look at the flash version trough http://www.goviral.com/book_2008 you can also download it on http://www.goviral.com/orderBook.php.