Social Media Promotions

One of the main purposes in employing Social Media in marketing is as a communications tool that makes the companies accessible to those interested in their product and make them visible to those who have no knowledge of their products. These companies use social media to create buzz, learn from and target customers. It's the only form of marketing that can finger consumers at each and every stage of the consumer decision journey. Marketing through social media has other benefits as well. Of the top 10 factors that correlate with a strong Google organic search, seven are social media dependent. This means that if brands are less or non active on social media, they tend to show up less on Google searches.
Twitter
Twitter allows companies to promote their products in short messages limited to 140 characters which appear on followers’ home pages. Messages can link to the product’s website, Facebook profile, photos, videos, etc.
Facebook
Facebook pages are far more detailed than Twitter accounts. They allow a product to provide videos, photos, and longer descriptions, and testimonials as other followers can comment on the product pages for others to see. Facebook can link back to the product’s Twitter page as well as send out event reminders. A study from 2011 attributed 84% of "engagement" or clicks to Likes that link back to Facebook advertising.