SEO and SMO goes hand in hand in my opinion.
It is best not to rely on one source of traffic — imagine if 80% of your traffic comes from Google and the change in their algorithm causes your site to lose its ranking. That's 80% of your traffic wiped out!
SMO is a strategy that has emerged that has the potential to create huge amounts of traffic for the site. Doing SMO can complement your SEO efforts.
One tactic — creating linkbaits or great content that people will naturally link to — people will tag, link, mention in blogs and put in their del.i.cious can boost your link efforts tremendously.
Plus, the heart of SMO is creating GREAT content — which is also the main ingredient in a successful SEO effort.
SMO can help rethink how to do SEO. Instead of webmasters buying software to automate the request for link emails, they simply need to create great content that they can leverage in social media optimization.
Using these strategies hand in hand can lead to the achievement of one goal — get more traffic to a site.