Designing Social Interfaces

This is a very well-written book, filled with explicative design patterns related to social interfaces and numerous known examples in the form of website images.

For experienced interface designers or even for some of the most observant web users, the patterns presented in this book may come across as obvious.

However, that's why they are called patterns—they are the most well-known common practices in the field compiled in one book.

I highly recommend this book. Even if people don't read it from start to finish, it still serves as a great reference book to have on your shelves, ready for you to consult a particular design pattern at any time.