Society is continually transforming and social media are accelerating the process. They are vehicles for communication and they cannot be classified as good or bad, but people can evaluate their use. They have contributed to changing the interactions of people and the way people do business, consume entertainment and search for information. Nowadays, there are many stories that tell of their use for manipulating opinions, but are social media effective in this? Do they provide benefits to society and at what price? These questions and a lot more have an answer in this book.