Both are required for get good backlinks.

I think both are useful.

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Book Marking Or Article both are best to promote the site ranking and traffic.

I think article is the best for generating traffic and given better backlinks than bookmarking.

Both are important to optimize the sites

If you want promote your site then both options are good.

If you crave transfer (swift) bookmarking can facilitate you a lot. Yet, recover search ranking, backlinks from articles assist supplementary than bookmarking. What do you think?

If you are looking for optimization in terms of increasing organic traffic, I prefer article submission. If you want traffic (sudden) bookmarking can help you a lot.However, to improve search ranking, backlinks from articles help more than bookmarking.

Social bookmarking is a good and effective SEO techniques. Through this technique, you can take the initiative of good website visibility and make the work done in an easy form.