Below are the Top bookmarking site:

Digg,Delicious,Diigo,Reddit etc..........

Some of the high social bookmarking sites are:
Reddit
stumble upon
slashdot
diggo
delicious

i think facebook is social the most powerful today. I used facebook and Google+ pr high

Digg
Delicious
Diigo
Reddit
Akonter
Folkd
Plurk
Techdirt.

Some of the high social bookmarking sites are:
Reddit
stumble upon
slashdot
diggo
delicious
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Social bookmarking is a centralized online service which allows users to add, annotate, edit, and share bookmarks of web documents. Many online bookmark management services have launched since 1996; Delicious, founded in 2003, popularized the terms "social bookmarking" and "tagging".

Social bookmarking is a centralized online service which allows users to add, annotate, edit, and share bookmarks of web documents. Many online bookmark management services have launched since 1996; Delicious, founded in 2003, popularized the terms "social bookmarking" and "tagging".

Social Bookmarking sites are the

Digg
Reddit
Plurk
Google +
Pinterest
Tumblr
Folkd

Thanks for sharing high PR sites with us.

High PR social bookmarking sites
Reddit
stumble upon
slashdot
diggo
delicious

Social bookmarking submission is best method Increase backlinks of website. Always Update the Fresh Content, title, Keywords etc.

Social bookmarking is a centralized online service which allows users to add, annotate, edit, and share bookmarks of web documents. Many online bookmark management services have launched since 1996; Delicious, founded in 2003, popularized the terms "social bookmarking" and "tagging".

Social Bookmarking submission are the best Method Increase traffic Ranking. You must do social bookmarking on high PR bookmarking websites which are very beneficial in fetching more traffic on the website and improves sites ranking.

Digg
Delicious
Stumbleupon
Reddit are best bookmarking sites

Reddit
stumble upon
slashdot
diggo
delicious have page rank