Bernard Kelvin Clive said this quote

People don't really trust advertisement they trust people. A large percentage of people make purchase decisions based on their friends review than just from advertisers. Brands that rely sole on adverts to sell, will eventually fade out. You need to get people to talk about your brand in a more positive manner without twisting their arms. If you fake it your will fade. So, focus on relationship marketing, because customers are the best brand ambassadors