For every successful campaign or event, there must be some gimmick. A talking point is needed in order to attract the attention of a lot of people. Tradition advertisement on newspaper, magazine or television may not be enough nowadays. 

Nowadays, with the popularity of mobile phone, people spend more and more time on their phones. Thanks to the development of mobile app ecosystem, people now do a lot of things on their mobile phone. They could browse website, play games, use whatsapp or facebook on their phone. It would be a good idea of the promotion of an event can also be done on the phone. Together with the widespread popularity of social media platform like facebook, wechat, sina, etc. Your promotion could be very much leveraged with the help of both side of the world. That is, app and social. A Mobile App offering something interesting helps to ignite and the social media helps to spread the message. That is what viral marketing means.