Digg and Delicious can be good for getting the word out. But facebook and twitter can be used if you followers (like a blog writer).

Propeller, technorati and stumbleupon can also be used.

So choose based on the community, not the bookmark itself. Remember: your job as an internet marketer is to provide quality to the web – that means the web users have to be interested in what you’re saying.

I have just started to involve in these site for my site http://www.cybernetvision.com

1. http://www.blogmarks.net/
Social Bookmarking with thumbnails. Atom enabled.
2. http://de.lirio.us/
Social Bookmarking, Tagging, Blogging & Notes. Mmmmmm, Notes.
3. http://del.icio.us/
Currently the most used software application.
4. http://digg.com/
Digg is a technology news website that combines social bookmarking, blogging, RSS, and non-hierarchical editorial control. With digg, users submit stories for review, but rather than allow an editor to decide which stories go on the homepage, the users do.
5. http://www.jumptags.com/
Jumptags.com is a revolutionary Web 2.0 social bookmarking web service for collecting, storing, sharing and distributing web bookmarks, notes, RSS feeds, contacts, and much more.

http://6-clicks.com 4
http://aworldofhelp.com/home/index2.htm 4
http://bluedot.us/friends/dots 0
http://bookmarks.blauerbote.com/ 0
http://linkatopia.com/ 0
http://linkfilter.net/ 6
http://maple.nu/ 3
http://meneame.net/ 5
http://motor.crispynews.com/5
http://my.xilinus.com/ 4
http://myweb2.search.yahoo.com/ 7
http://popurls.com/ 0
http://recommendit.dehsoftware.com/ 0
http://say.something-everything.com/ 0
http://scuttle.org/ 6
http://suckingfish.com/welcome.do 6
http://supr.c.ilio.us/ 6
http://tagsy.com/ 3
http://thumblicio.us/ 0
http://unalog.com/ 5
http://www.30daytags.com/fresh 5
http://www.allmyfavorites.net/ 4
http://www.ambedo.com/5
http://www.blinkbits.com/4
http://www.blinklist.com/ 6
http://www.bloghop.com/7
http://www.bloglot.com/ 2
http://www.blogmarks.net/6
http://www.blogmemes.net/ 5
http://www.blogpulse.com/ 7
http://www.bmaccess.net/ 4
http://www.bookkit.com/ 4
http://www.butterflyproject.nl/ 4
http://www.citeulike.org/ 6
http://www.clipfire.com/6
http://www.collectfavorites.com/ 0
http://www.complore.com/ 0
http://www.digg.com/ 7
http://www.diigo.com/ 6
http://www.linkarena.com/ 4
http://www.lookmarks.com/ 5
http://www.markaboo.com 6
http://www.mecanbe.com/temp/default.aspx 0
http://www.mecanbe.com/temp/default.aspx 6
http://www.meme-stream.com/ 3
http://www.millionsofgames.com/ 5
http://www.mybookmarkmanager.com/ 5
http://www.mylinkvault.com/ 5
http://www.mypip.com/home/ 5
http://www.mystickies.com/ 6
http://www.newsvine.com/7
http://www.nextaris.com/ 7
http://www.nowpublic.com/ 6
http://www.onlywire.com/ 3
http://www.peoplefeeds.com/5
http://www.phigita.net/ 5
http://www.pligg.com/ 5
http://www.portachi.com/5
http://www.reddit.com/ 0
http://www.rojo.com/ 0
http://www.rollyo.com/ 6
http://www.searchles.com/ 0
http://www.shadows.com/ 7
http://www.shoppersbase.com/ 0
http://www.shoutwire.com 5
http://www.simpy.com/ 6
http://www.sitejot.com/ 5
http://www.sitetagger.com/ 2
http://www.spurl.net/ 6
http://www.squidoo.com/ 5
http://www.stylefeeder.com/ 4
http://www.stylehive.com/ 5
http://www.syncone.net/ 1
http://www.taganiche.com/ 0
http://www.taghop.com/ 4
http://www.tagtooga.com/db.tag 0
http://www.tailrank.com/ 6
http://www.technorati.com/ 8
http://www.ticklr.net/ 0
http://www.urlex.info/ 0
http://www.wirefan.com/ 0
http://www.wurldbook.com/info/ 6
http://www.youtube.com 5
https://ma.gnolia.com/ 5
https://www.chipmark.com 5
http://3form.com/ 4
http://adoppt.com5
http://articletag.com/index.php4
http://buddymarks.com/ 6
http://del.icio.us/ 8
http://dev.upian.com/hotlinks/ 6
http://dohat.com/dohathome3.html 3
http://feedmelinks.com/portalc 3
http://frassle.net/ 6
http://gnafi.com/ 5
http://indiagram.com/index.php 4
http://kinja.com/ 7
http://listmixer.com/ 6
http://mybookmark.gokodo.com/ 0
http://myprogs.net/ 6
http://segnalo.alice.it/ 5
http://socialbookmarking.org/ 0
http://tags.library.upenn.edu/ 5
http://ww2.ikeepbookmarks.com/ 2
http://www.30daytags.com/fresh1
http://www.backflip.com/login.ihtml 6
http://www.beanrocket.com/ 6
http://www.blabb.com/user/blabb.php 0
http://www.bookmark-manager.com/ 5
http://www.bookmarktracker.com/ 5
http://www.browsr.com/ 5
http://www.clipclip.org/ 4
http://www.clipmarks.com/ 4
http://www.cluebacca.com/ 6
http://www.connectedy.com/ 5
http://www.connectedy.com/ 7
http://www.crispynews.com/global 2
http://www.de.lirio.us/ 3
http://www.dinnerbuzz.com/ 5
http://www.eggkeg.com/ 0
http://www.eigology.com/dogear/ 3
http://www.esnips.com/signin/index.jsp 4
http://www.fantacular.com/ 5
http://www.fark.com/ 8
http://www.fatredfish.com/ 0
http://www.favmark.com/ 4
http://www.favoor.com/ 3
http://www.feedalley.com/ 5
http://www.feedmarker.com/ 6
http://www.filangy.com/index.jsp 5
http://www.flipskipper.com/ 3
http://www.forumsofindia.com/ 0
http://www.fungow.com/ 0
http://www.furl.net/ 8
http://www.gather.com/ 5
http://www.getboo.com/ 1
http://www.gibeo.net/ 6
http://www.Givealink.org4
http://www.goobtoob.com/ 0
http://www.google.com/notebook 7
http://www.gravee.com/ 5
http://www.guicookies.com/ 4
http://www.hanzoweb.com/ 6
http://www.i89.us/ 3
http://www.icerocket.com/ 7
http://www.igooi.com/ 5
http://www.indiamarks.com/ 2
http://www.jeteye.com/ 5
http://www.jots.com/ 6
http://www.kaboodle.com/ 6
http://www.kmfavorites.com/ 5
http://www.kuro5hin.org/ 8
http://www.librarything.com/ 7
http://www.lifelogger.com/ 5
http://www.lilisto.com/ 3
http://www.linkagogo.com/go/Home 5
http://www.linklog.nl/ 0
http://www.linkologia.pl/4
http://www.linkroll.com/ 6
http://www.listible.com/ 2
http://www.minddeposit.com/0
http://www.myhq.com/ 5
http://www.myvmarks.com/ 6
http://www.netvouz.com/ 6
http://www.openbm.de/ 5
http://www.oyax.com/ 4
http://www.peoplefeeds.com/4
http://www.pixelmo.com/ 0
http://www.rawsugar.com/index.faces 4
http://www.rrove.com/home 5
http://www.smarking.com/ 2
http://www.stanmx.com/sabrosus/ 4
http://www.stumbleupon.com/ 7
http://www.tabmarks.com/ 5
http://www.ticklr.net/ 4
http://www.tutorialism.com/ 0
http://www.wists.com/ 6
http://www.yoono.com/ 6
http://www.zaadz.com/ 5
http://yummy.printfu.org/ 5

All the best
http://www.seoboot.com