Social Media Marketing
"Social media" signifies a broad spectrum of topics and has several different connotations. In the context of Internet marketing, Social Media refers to a collective group of web properties whose content is primarily published by users, not direct employees of the property (e.g. the vast majority of video on YouTube is published by non-YouTube employees). Social media optimization (SMO) is the process of trying to get one's content more widely distributed across multiple social media services.
Social media marketing has two important aspects. The first, SMO, refers to on-page tactics through which a webmaster can improve a website for the age of social media. Such optimization includes adding links to services such as Digg, Reddit and Del.icio.us so that their pages can be easily 'saved and submitted' to and for these services.
Social media marketing, on the other hand, is about building ways that fans of a brand or company can promote it themselves in multiple online social media venues.
Some social media marketers offer to write content that is remarkable, unique, and newsworthy. This content can then be marketed by popularizing it or even by creating a “viral” video on YouTube and other video sites, including getting involved in blogs, forums, and niche communities. Others in the social media world consider this form of social media marketing Astroturfing or "fake grass roots".
Traditional Marketing
Marketing is an ongoing process of planning and executing the marketing mix (Product, Price, Place, Promotion) for products, services or ideas to create exchange between individuals and organizations.
Marketing tends to be seen as a creative industry, which includes advertising, distribution and selling. It is also concerned with anticipating the customers' future needs and wants, which are often discovered through market research.
Essentially, marketing is the process of creating or directing an organization to be successful in selling a product or service that people not only desire, but are willing to buy.
Therefore good marketing must be able to create a "proposition" or set of benefits for the end customer that delivers value through products or services.
Source: Wikipedia