Social media optimization should include social bookmarking because both are under one umbrella. Unlike SEM or SEO, where both targets different section.
Social Bookmarking is one of the very minor part of SMO and I think both are important Social Bookmarking help us to increase traffic and get index quickly. SMO help us to increase traffic in huge volume on your site. So, I suggest you concentrate on both techniques.
SBM is used to get indexed soon into Search engines, where as SMO is used to get more visitors(traffic) to a Site. If its wrong please correct it.
SMO and bookmarking is something similar. Some of the bookmarking sites also come in SMO. So, its better to work with both, instead of choosing one.
social book marking kind of offpage seo technique by which we increase the backlinks as well as traffic. social media optimization a technique by which we increase the traffic on our website. social media sites like twitter, face book etc. as i know that social bookmarking good which provide the dofollow backlinks as traffic.
Both are different. Social Bookmarking is the minor part of SMO,which we increase the backlinks as well as traffic and SMO help us to increase traffic on your site.
Bookmarking isn't a part of SEO in the first place. It is simply a technique to drive temporary traffic to your website.
When you put some questions in forum, consider twice, "will this question be interesting and knowledge - enhancing for digitillians?" I see some question which are so basic that a novice knows it.