i thing SMO is best way of increase your website traffic is social media optimization but the excellent sites and good traffic and good High Page Rank is Facebook, twitter, tumblr, Pinterest, hi5, Google+, youtube, reddit, quora, slideshare, delicious and stumbleupon.

Social bookmarking are temporary back-link service for website. these all the link of social bookmarking is removed by 2-3 months.

Ok for social bookmarking
 

Social bookmarking is a smart way to build traffic

Search engines are crazy about content. If you want to have a good start in your business, fill your site with the best quality content in your market. That way, when people come to your site they will stay longer, they will bookmark your site and ultimately (hopefully) buy from you. So not only will fresh new content on your website make you more popular with the search engines, you will also be perceived as an expert in your niche and people will come looking for your site time and time again.

For getting traffic social media sites are the best means and it will help you get a huge traffic to your site. But it will not help in getting keyword ranks as it do not give do follow links.

facebook is the best and popular

share your posts in social media it will increase domain trust

Social bookmarking is the best way increasing the traffic of the site

i think Twitter and facebook both are the best social way to improve web rank.

Today also social bookmarking is the best for getting traffic and seo experts are also doing social bookmarking as the first preference.

Social bookmarking is best way increasing the traffic of the site.Bookmarking is good way generate the back links.