Actually we have many differents strategies to use the Social media (SM) tools, but we have to find what is the best strategy for our business.
We have to elaborate complex tactics to achieve information about genereated leads, custumer conversations and measure incomes.

The biggest companies use 5 strategies to generate sales.
Brand Image: One of the pricipal SM goals is to advertise brands and increase the notoriety brand online.
A relevant fact is promote brands through platforms such as You Tube. Create videos and share information about our brand.
Online Sales: It´s only possible by SM to buy and sell online. It´s the best way to advertise products, publish offer and discounts.
Market Research: Use SM as an information resource tools to get valuable information about our customers.
For example, Starbucks by means of its website, to ask opinions, ideas and suggestions from their customer.
Loyalty Costumers: It´s an opportunity to keep close to yours customers, solve doubts and generate trust. SM is an implement to control your costumer target.

The biggest companies use this strategy to increase sales, you have to fit this strategy to your own business. Because each business is different, then, each strategy is differ.
Source: Social bla bla
Good Luck ! ! !