Bookmarking is a way to save, organize, search and manage Web posts “bookmarks”. Users use a social bookmarking site to store these links, save links to web pages they like or share. These bookmarks are usually public. And they can be viewed by other members where they are attached post link. Below some example of bookmarking site list.
StumbleUpon
Reddit
Slashdot
CiteULike
Scoop.it
Plurk
Fark
Pearltrees
Url.org
Instapaper
Most social bookmark websites are organized by users by applying “tags” or keywords to a website’s content. This means that another user can view the bookmarks associated with a selected tag and view information about the number of users with their bookmarks. In many cases, users can comment or vote on bookmark items.
It’s a very good question, How you collect? No problem- I think, you know about bookmarking or not, but you need the bookmark for your website post. There are many websites on the internet which are providing lists. So doesn’t matter, open a new tab and write this type of keyword for search-
After collecting the site list you must Check all the site of them working or not. And these sites are indexed by Google or not. Otherwise, you will lose your valuable time.
Social Bookmarking webSite list