What is Besnifit of SMO

hi
I want known about SMO.how can promote my business online through Social media Sites what all have SEO site Please give me suggestion best of my effort business promote and knowing more people to my websites <snip>

There are several open threads on this topic up right now that would be a great place to start before you circle back with more direct questions about your business…

http://www.sitepoint.com/forums/showthread.php?901682-How-do-I-find-the-most-active-online-communities-related-to-my-topic