Primarily, a review on theoretical foundations and the history of Viral
Marketing is shown. Based on this, different definitions were analysed
to set up a practical definition for this study. Thereafter, possible
targets of Viral Marketing are illustrated, followed by necessary
elements of Viral Marketing campaigns and finally by an approach to
measure the effectiveness. By means of an online questionnaire, a survey
was conducted to collect empirical data. These data provide information
about Viral Marketing within social networking sites and detect useful
information for the practical use of Viral Marketing. The results of the
analysis show the accelerating influence of social networking sites and
other factors regarding the effectiveness of Viral Marketing. In
addition, specific characteristics which make Viral Marketing messages
appealing as well as the preferred types of Viral Marketing messages are
illustrated. They help to understand how to create and design an
effective Viral Marketing Campaign.