Can any one tell me what Role does Social media Plays On Search Ranking

Social media is most powerful thing to boost ranking and get good number of traffic for your site/blog.

Social media give us a traffic and leak our privacy with the public.

Social media helps in getting traffic for website. If a website gets lots of like, share, tweets, etc then it will boost ranking.

social media is very usefull site get traffic....once you get referral traffic from social media sites it helps to increase serp position in search engine

it makes lots of traffic to the webiste

social media is very usefull in site back links...

Now days, Social Media plays a crucial role in the search engine ranking of any website. After the Google panda, penguin, hummingbird algorithms updates, Google takes social media signals as a trust factor and give the higher ranking to those website whcih has higher likes, shares, pinned, twitter etc.
So, if you have a website then try to use good use of varioous social networking and social bookmarking sites like Facebook, Twitter, Pinterest etc., so that your search engine ranking will improves.

SMO is best technique for get more and more traffic.

SMO is very reknown and result oriented technique used to gain likes, visitors, traffic in short business for your site.

Social media is to break it down. Media is an instrument on communication, like a newspaper or a radio, so social media would be a social instrument of communication.

In Web 2.0 terms, this would be a website that doesn't just give you information, but interacts with you while giving you that information. This interaction can be as simple as asking for your comments or letting you vote on an article, or it can be as complex as Flixster recommending movies to you based on the ratings of other people with similar interests.

Social media allows you to "crowd source" your link building.
When you have a following on Twitter or Facebook or LinkedIn, you create a team of fans who can share your content. That's what social media is all about, folks -- being social! (Imagine that.)

So when you write a new blog post on your business blog, you can take that content and share it on Twitter and then get some of your followers to share your content. You can also get your website visitors to share pages of your site and your blog on social media by adding simple social buttons to allow people to quickly and easily "vote" for your content right there on your website.