For example, You provide product to customer politely and suggest them to suitable, don’t suggest for the only sale or only to get their money, you have, to be honest, and do it in fact and sincerely. And then, the customer will impress you in good feeling, so they want to come back and buy your product again. In addition, they will tell others to come to you. You didn’t lose money for advertising and you also get repeat customers. For bad feedback, of course, it is not good for your company. You will get damage from social by word of mouth, this is more power for make you lose many customers. In nowadays, social online is very popular and it makes people know the news quickly. Whether the news is true or false. When you get a mistake, if customer post on the internet or social network, many people will know quickly and they will judge you for negative ways, even if it’s the first time that you get a mistake. Or that mistake didn’t strongly and maybe customer take it wrong.