Social bookmarking sites have experienced tremendous growth and popularity in the last year. Wikipedia defines these sites as “an increasingly popular way to locate, classify, rank, and share Internet resources through the practice of tagging and inferences drawn from grouping and analysis of tags.”

SEO experts all agree that these sites are an excellent source of organic traffic and exposure.

Standard directory submission has the primary objective of increasing Google Page Rank, backinks, SERPs.

Social bookmarking on the other hand, has the primary objectives of increasing traffic, site exposure, and reaching new markets. The response is usually very fast as well.

The traffic bump you can see to your site can be within a matter of minutes in some cases. Generally when submitting your link on an Social Bookmarking site, you will be listed on the front page for a short time, generating the initial traffic boost. The interesting thing that can happen with social bookmarking, besides the initial traffic increase, is that your link can get picked up by others and published in more places.

Very commonly people will post your link in blogs, forums, and other bookmarking sites which creates a viral effect. A further SEO benefit of social bookmarking sites is that they are a good way to have your website indexed quickly by the major search engines.

List of Social Bookmarks Sites

del.icio.us : [PR8] By Joshua Schachter and acquired by Yahoo. Clever text based using Tags. Homepage now shows Hotlist updated every hour. Update! Front page has been restyled [ info], Search drop down menu, Network badge, Randomizer bookmarklet which opens a radom link and search has a menu to search user bookmarks, del.icio.us or the web.
Chipmark : [PR5] by a group of Computer Science students[ info] Open source social bookmarks using folders and labels.
Connectedy : [PR5] Text based interface Social bookmarks using Folders.

Connotea : [PR7] Open source for academics, research, entrepeise social bookmarks using tags. Update! Complete update, faster page load, new UI… Added automazicaly import blog citations. Tag suggestions. Search user, tag, my bookmarks, via google.

Diigo : [PR6]“Digest of Internet Information, Groups and Other stuff.” Web 2.0 style text-based interface, bookmarks and annotation using Tags. The toolbar gives highlight and blogging support. Update! UI redesigned.

Feed Me Links! : [PR5] Open Source Social Bookmarks using Tags

Furl : [PR8]“File URL” by Looksmart. Social Bookmarks using topics

Lookmarks : [PR4] Text based interface with many format support and playlisting.

Ma.gnolia : [PR3] Web 2.0 style community driven social bookmarks using Tags. Update! Root: bookmarklet and button showing web page information and rating at ma.gnolia.

Netvouz : [PR7]“interNET rendezVOUZ” Social bookmark manager using tags and folders.

RawSugar : [PR6] Web 2.0 style social search engine with Clustered tagging.

Simpy : Social Bookmarks and notes using Tags with a Text-based interface. : import users from de.lirio.us as it will shut down.

Spurl : [PR7] For SPecial URL. Web 2.0 style interface using Tags and Folders. Uses Zniff as search engine.

Unalog : [PR6] Text based interface using Tags.

Yahoo! My Web : [PR6] Update! BETA Social bookmarks using tags, folders and thumbshots. Now with global access options (Private, the Yahoo! community or everybody).
Backflip : [PR7] Social bookmarks using folders. [ Review] [ User].

BibSonomy *: [PR6] Social bookmarks and publications using tags with a text based interface.

Blogmarks.net : [PR7] by BmTeam. Web 2.0 style Social Bookmarks with Thumbshots. Network and interface has been redesigned.

BmAccess : [PR5] Web 2.0 style Social bookmarks using tags and folders with thumbshots. [English/French] [PHP/MySQL/JS]

BookmarkTracker : [PR5] Bookmarks using folders and public directory.

BuddyMarks : [PR5] Update! Social bookmarks using Tags in a directory style interface. Now has publishing!

ButterFly : [PR5] Web2.0 Social bookmarking using tags with annotation and page editing capabilities.
CiteULike : [PR7] by Richard Cameron. Text-based service with tagging to help academics to share, store, and organise the academic papers.

Complore : [PR5] beta “Come Xplore” Network community with blogging, forums and bookmarks using tags.

de.lirio.us : [PR6] Open source del.icio.us clone using Tags. ! Will shutdown. Users are moved to Simpy!

excites : [PR3] Social bookmarks using tags and thumbshots.

ez4u.net : [PR4] Social Bookmarks using categories.

Fungow : [PR4] “fun-go!” Web2.0 Social bookmarking using Folders, where each user URL is a tabbed single page application.

Goesby: [PR4] Social bookmarks using search with RSS suppot.
igooi : [PR5] Simple text based interface using Tags, categories and folders.

iKeepBookmarks.com: [PR4] Web1.0 style Text based interface.

indiamarks : [PR5] Social bookmarking using tags and categories focused on India. Tag cloud shows number of bookmarks.

Jots: [PR6] Text based interface using tags.

Linkatopia : [PR5] Web 2.0 style Social bookmarking using Tags.

Linkarena: [PR4] Social bookmarks using folders and search. Free, premium and Pro accounts available.

Linkroll: [PR6] Social bookmarks using tags(called categories).

Markboo : [PR3] Web 2.0 style Open source Social bookmarks using Tags with image and music support.

MyLinkVault : [PR5] Ajax enabled, bookmark startpage with expand/collapse blocks

myHq : [PR5] Simple text based interface where the bookmarks are automatically formatted into a table..

MyPIP : [PR4] Service for creating personal pages of bookmarks. Demo available.

myVmarks : [PR5] Web 1.0 style Social bookmark startpage.

Namakkal: [PR5] WordPress style interface with a simple public bookmarking using tags.

OpenBM : [PR5] Beta. Text based interface, has support in English and German.

onelurv : [PR4] Social RSS reader, social bookmarks startpage using tags and password manager.

Oyax: [PR4] Beta. For non-commercial use only.

PennTags : [PR6] Text-based. by University of Pennsylvania.

Plum: [PR4] Private BETA. Social bookmarks that also allows users to bookmark items on their computer, share emails and photos

sa.bros.us: [PR4] Open source del.icio.us clone.

Scuttle : [PR6] Open Source Social Bookmarks using tags.

Shadows : [PR7] Bookmarks and Network, it’s connected to Pluck with a tabbed interface and thumbshots.

Sitetagger.com: [PR0] Nice simple text based interface.

Smarking : [PR5] BETA For Social bookMARKING. Social Bookmarks using Tags. Exists in English and Italian.

Socialbookmarking.org: [PR5] Web2.0 style Social bookmarks using tags, where each user gets his own domain URL and a startpage

SyncOne.net : [PR4] Web 2.0 style Social Bookmarks and RSS reader, tabbed interface for bookmarks/clips, Media(only with extension) and Feeds. You can search public bookmarks but not browse them.

StyleFeeder: [PR5] Social bookmarks using tags, small images and a simple text based interface, basicly for shopping items

Sync2It : [PR5] Social bookmarks using clusters. Free for students, teachers….

Taggly : [PR5] English and Italian Social bookmarks using tags and thumbshots.

URLex: [PR4] Community with clippings and RSS

WireFan : [PR4] Social bookmarks using tags.

Xilin.us : [PR5] Web 2.0 social bookmarks with a nice comment section to post, discuss features.

Yoono: [PR6] Suggestion and Social bookmarking using folders.

Wink: [PR6] BETA Web 2.0 style Social bookmarking from search results.

Listible! : [PR6] Web 2.0 style service using tags.

Listerlister : [PR6] Same system as Listible! without commenting but has moderation.

reddit: [PR7] Social Bookmarks with voting and karma, Network and categories using sub-domains

Supr.c.ilio.us : [PR6] Alpha. Web 2.0 style Public social bookmarks listed in rating order.

SWiK: [PR7] The Open Software Wiki, Web 2.0 style community driven resource for open source software using Tags, Ajax and Textile markup.

TagTooga : [PR5] Web 2.0 style Social Tag based Internet directory with many features and format support.

BlinkBits : [PR6] Web 2.0 style Social Network, linkblog, bookmarks and RSS aggregator.

Boxxet: [PR5] Web 2.0 style Social bookmarks for creating collections, bookmarks, video, images.

Clipmarks: [PR6] Web 2.0 style community, that lets you chat about clippings and videos. Uses categories, tags and comments

eSnips: [PR4] Social network and secure file hosting for sharing/saving links, files, images, music, video using folders and tags. 1GB free

FARK: [PR8] Community with public bookmarks by category, sumbit and comments.

Gabbr : [PR6] Social News community with comments. You don’t have to register to comment.

Squidoo : [PR7] Web 2.0 style Social Network for creating ‘lenses’ for any subject, a kind of topic page, with drag and drop sorting for links.

StumbleUpon : [PR7] Web 2.0 style Social Network for recommending with ratings, tags and user tag clouds.

Zimbio: [PR6] Public community portal gathering information on any subject

Squirl : [PR6] Web 2.0 service for managing collections of books, photos, movies.

Wists: [PR6] Social Shopping with images and tags.

Yummy!: [PR5] PDF Library using tags.

co.mments : [PR6] Social service to centralize comments, you bookmark and tag comment pages to follow them at co.mment.

coComment : [PR7] Social commenting system that bookmarks and follows comments you’ve made on blogs.

MyTago: [PR5] Special kind of social bookmarks for mobiles using tags

i89.us : [PR4] Social bookmarks using tags with tabbed interface.

Popularity: 15% [?]