Does social media play an important role in sales and marketing?

yes of course its play an important role in sales and marketing... to increase  the opportunities of profit to the company and create anew markets to achieve   a great profit and increasing  the rate of growing to sales and create a new markets then the sales grow on so that  we can say social media is important to make  lot of propaganda to advertise your products so you use the sales and marketing  theory for that so   so that we say that  the social media plays an important role of sales and marketing ....