SEO Vs SMO
 

How much does Facebook and Twitter affect a site's SEO rankings?

In recent years Google has placed more and more of an emphasis on social signals. SMO is often mistakenly thought to be based upon the size of your fan base on Twitter or Facebook for example. However, what Google actually takes into account are the lnks between social networking websites and your own.

Twitter’s affect on your ranking is determined by who the lnk to your site is coming from. If a Twitter account with a lot of authority lnks to your site it can have a positive impact on your social media marketing. In a similar way, if a ink to your site is very popular on Facebook and “shared” by a large number of people it can also affect your Google ranking positively.

Now some where social media has great role in promotion of website. Social media back-links if very beneficial for ranking.

Social media plays an important roll in seo like linked-in, facebook, twitter etc.

Social media has always been a part of SEO. 'Cause SEO is also a way to increase your traffic.

Facebook and twitter increase the traffic to the website and they directly doesn't affect the website ranking but indirectly boost the website by increasing the traffic to the website

SEO Vs SMO Both Of Techniques are the Good for Promote Business.
SEO Stand for Search engine optimization. SEO main motive is increasing the Keyword ranking of website. SEO Mainly Two type On page SEO and Off page SEO. Off page Activity are the Article submission, Blog Submission, Classified submission, Forum Posting etc.
SMO Stand For the Social Media Optimization. Social Media are the Good way increasing the traffic ranking of website. Update the Daily Social Profile Facebook, Twitter, Google Plus, LinkedIn etc.

Thanks to all for their important information.

Facebook and twitter are helps to increase the traffic for website.

There has been much speculation and misinformation in recent years about whether social signals from Facebook and Twitter factor into Google search algorithm, and if so, how much. While some SEO professionals focus on social media for the rankings potential, others strictly look at social for the traffic, awareness, and other indirect benefits.

Matt Cutts, the head of Google's webspam team, tackled the subject in his latest webmaster help video, which asks whether Facebook and Twitter signals are part of the ranking algorithm, and how much they matter.

from social media optimization you can increase traffic from doing this works