The process in which bookmarking the webpage or anything which is found on internet then share it with everyone on internet is Social bookmarking.

Social bookmarking is “nofollow” attribute to the links submitted, means that Google will not be passing on any page rank for the link “nofollow”  no improvement in SERPS.

Social bookmarking increases the traffic to your website which increases the credibility among search engines and improves the rank of your website in search engine result.