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The classic foundation of social media marketing is facebook, twitter, LinkedIn, and YouTube, but of course you can pick a la cart from these, and there are plenty of other things you can do as well. My company doesn't use twitter, but does make use of the other three. There is a great benefit in making use of social media, it helps you maintain relationships with customers that already exist and allows you to market your company to new potential customers and develop leads. You are able to connect with prospects in a way that otherwise would be impossible, and can develop a know, like and trust factor for your company. It is much more effective that simple "post and look" advertising in my experience because it essentially allows ersatz conversations to occur between your business and customers/leads. Social media marketing is probably the most cost effective method we have of increasing our profile, generating new customers, and maintaining relationships with existing customers. Dollar for dollar, it has provided a much greater benefit than any billboard ever could.