“Social media marketing” is the use of social networks like Twitter, Facebook, Myspace, Linkedin, blogs, wiki or any other type of online media to increase your business’ online visibility. Social marketing is one of the easiest and least expensive (most of the time free) ways to get large amounts of traffic to your site. Let’s face it, the bottom line, marketing is to get people to buy or pay for what you are supplying.
The answer is YES. Creating inbound links to your site for free is always good. Some inbound links can actually be harmful to your search engine ranking. Links that come from link farms (sites that just link to anything) are not good links.
Some links are more beneficial than others. Having links from relevant sites that have higher page ranks like 3 and up are better than being linked on a page that has no page rank. Being linked on pages that are relevant to your site that has no page rank or low page rank are still good to have because you will gain some traffic to your site from these links and they will have no negative effect on your ranking.