No matter which type of marketing promotion and advertising you choose, it is always crucial to find a manner which will result in the least amount of costs while providing the biggest and most effective outcome. Word of mouth has been considered the most powerful tool for a long time, and today it still stands out as the most powerful weapon in a sea of promotional formats. If you combine word of mouth with the mass development of the Internet, you get a technique which keeps gaining popularity, namely viral marketing. Viral marketing is one of the “mouth to mouth“ marketing methods with which content spreads from person to person via the Internet like a virus. The important thing here is to create sufficiently attractive content, interesting and brief, so that it entices the user to share it. With viral marketing, it is the users who carry out the advertising. With the expansion of mobile technology, mobile marketing is gaining importance and is easily becoming the core place for communication. Mobil marketing offers different forms of advertising, and with the ever-growing popularity of social networks and applications it is becoming the focal point for conducting promotional ads and marketing tricks. Among the large number of applications and social networks a few of them stand out by offering the best type of communication and the possibility to advertise; each company should therefore carry out an analysis before providing their content so that they can achieve the desired results. Apart from a host of advantages and some disadvantages, viral marketing requires a lot of effort and preparatory investigation in order to create content capable of attracting attention; a certain amount of time is also necessary to monitor its effect since results will not be achieved within a day, but long-term results will be achieved after a certain amount of time.