Marketing has been greatly impacted by social media and internet developments. In the past decades a massive change within the disclosure landscape and the communication between companies and their stakeholders has taken place. In order to stay competitive on the market, companies have to identify the advantages and opportunities given by social media. Using various social media platforms, companies can benefit in different corporate areas, like marketing, public relations, human resources or customer services. Since every platform has its own goals and approaches a different target audience, the companies have to choose the most appropriate platforms and then develop a specific strategy. This book shows the motives for companies to invest in social media and clarifies complicated concepts. Furthermore, it evaluates various social media channels and their effectiveness as well as their return on investment measurements.