It's a type of making Backlinks for blog to get better ranking in SERPS.

Ofcourse,Social bookmarking is very helpful in building quality back links which drives more traffic towards your website.If you want to check more benefits then
1. You have an option allowing the bookmarking site to pull your current bookmarks from your computer and transfer them to their site. This makes it easy to get your favorite sites online without a lot of tedious catch up work.

2.You can set it up so the site sends you a notification for specific tags to let you know when someone on the network creates a bookmark using that same tag. This keeps you completely current on any tag you’re interested in.

3. Other users around the globe can see your bookmarks online and making your site hyper‐visible.

if we want to promote our site. so we have to create back links.

Yes. Social bookmarking is beneficial for you site. It can basically give you two things.
1) Back links
2) Traffic

social bookmarking sites simply increase the popularity and visibility of the website.

Social bookmarking sites is the best way to get quick traffic to any web page. It is very helpful to building backlinks to the website.

Social bookmarking is the best way to store our website information and for caching our sites in a regular basis.

Here is my idea: All of the social bookmarking sites will give you one way links that the search engines can recognize and help you to build Google Page Rank. It can be a top benefit!

yes it is beneficial but only bookmarking is not enough.. you can do other techniques also like directory submission, forum posting, search engine submission, etc to bring more traffic on your blog or website.

Hi,
Social bookmarking help us to get backlinks, and you can advise your business on online and get much more benefits.
Thanks

It is the best way to promote your product.

Social bookmarking allows users to store, organize, search, and manage their content on the Internet by using tags or keywords that are relevant to the web page they are wishing to share.

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the main benefits of social bookmarking,they give instant backlinks