Top 10 Most Popular Social Bookmarking Websites

1.Facebook
Facebook is a social networking service and website launched in February 2004.Facebook has more than 800 million active users.Alexa Rank-2

2.Twitter Twitter is an online social networking service that enables its users to send and read text-based posts up to 140 characters, known as "tweets". It was created in March 2006.Alexa Rank-10

3.Digg
Digg is a social news website.its cornerstone function consisted of letting people vote stories up or down, called digging.It was created in December 2004.Alexa Rank-193

4.Stumbleupon StumbleUpon is a discovery engine (a form of web search engine) that finds and recommends web content to its users launched in November 2001.Alexa Rank-120

5.Reddit reddit is a social news website where the registered users submit content, in the form of either a link or a text "self" post.Created in October 2006.Alexa Rank-114

6.Delicious
Delicious is a social bookmarking web service for storing, sharing, and discovering web bookmarks.It was created in 2003 and acquired by Yahoo! in 2005.Alexa Rank-370

7.Tweetmeme TweetMeme is a service which aggregates all the popular links on Twitter to determine which links are popular.Alexa Rank-852

8.Blinklist Easily Share Your Links with Others: While browsing, you can save and share links in one click.Alexa Rank-5879

9.Friendfeed FriendFeed is a real-time feed that consolidates the updates from social media and social networking websites, social bookmarking websites, blogs and micro-blogging updates, as well as any other type of RSS/ Atom feed.Alexa Rank-1438

10.Hacker News
Hacker News is a social bookmarking site with share your link.Alexa Rank-1764