Social Bookmark is one of the top three links building strategies.It is one of the fastest acting SEO options.It brings about numerous benefits to your website .An social Bookmark site are know to feature fresh content search engines visit the social bookmarking site frequently and this is one of the advantages of getting your backlinks from it.Your links will be indexed fast by the search engines.
Why you do it :-
1.Indexing Sites Faster. 2.Deeper Indexing 3.Measuring Quality. 4.External Meta Data. 5.Co Citation . 6.Number of Votes. 7.Categorization.