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Word of Mouth as one of most prominent marketing techniques has a very long history. Its application in modern society, especially in wast social network, is something that is highly interesting. Social networks provide unique and dynamic method for spread of information. Information about specific product can be spread throughout entire network at very low price of simply posting an update on corporate social network profile or in a specialised journal. The main purpose of this study is to identify and quantify effects of word of mouth marketing across social networks.