According to me, this type of Social bookmarking sites are also helpful for the link building. There is a option of "Follower and Following" existing in every Social bookmarking site. It's really the best way to create huge traffic to site and it also wonderful source to improve votes for our site.
Social Bookmarking is one of the off page techniques in Search Engine Optimization.
Publishing in High Page Rank Social bookmarking sites will bring your good backlinks and visitors to your site, To avoid pending you can make friends so that alternatively you can get vote from your votes!