http://www.maniacsolutions.com/viral-marketing-means/
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what is meant by: Viche pixel marketing viral marketing
The use of viral marketing word of mouth to virally spread the message of the ad and brand message I think you meant instead of marketing to a specific market segment. This strategy seeks to gain a dominant position in a certain segment of the global market. For example, you may decide to design a car for adults with physical disabilities. In this way you market niche.
RHA Viral Marketing