yes, social bookmarking submission are beneficial for generating traffic and they will increase your backlinks also.so do bookmarking and directory submission.
Social bookmarking submission is a good source to bring traffic. Considering the other methods this is the safe method for doing off page SEO. To work it effective way make sure you have quality content.
Not recommended to use the tools for social bookmarking. You have to make it manually for proper effect. This also helps to get index early on google. You can bring niche relevancy traffic from doing it the right way. That will decrease the bounce rate of your site.
