Impact of internet in changing the marketing strategies

Strategic change is defined as “change in the content of a firm’s strategy as defined by its scope, resource deployments, competitive advantages and synergy(Hofer and Schendel 1978)
Strategic change can be affected by the internal and the external conditions of a firm because a firm or a company’s performance depends on the opportunities lying externally and how well it can save itself or counter the external changes. Things keep changing outside a company and the threats vary from the competitors to the market status. As a result, companies have to adopt new strategies to avoid biting the dust. It also depends on the way an organization utilizes its resources and the way in which capital is invested. Why marketing strategies are changing because of the web presence. For any business organization in today’s scenario it is very important and urgent not only to show its high-street presence but also to show it’s online or web presence and for the same purpose e-business is the hot favorite of everyone. We can define e-business as operating the business on the Internet, not only buying and selling but also serving customers and collaborating with business partners.
I am looking answer of following question in retail industry:
1. How internet is changing the whole marketing strategies and the overall business process of retail industry?
2. How retail business’s e-marketing strategy forms a platform for the success of a business and a framework for all the stages and functional areas?
3. Is it necessary for a company to carry both types of businesses as it increases the investment and labor for same type of goods & services being sold by both the operations?
4. Are the models complimentary to each other or are they independent of each other?
5. What is the profitability margins in both and which type will dictate in the future?
6. How are retail marketers taking advantage of latest internet marketing tools like social media?
Any comment???