Social networks are trully helpful when you are promoting your site to sell your products to people anywhere in the world, hope this list will help you: http://orangecopper.com/blog/list-of-all-top-social-networking-websites-as-on-2010
Hi, you can check out my list of top 77 social bookmark websites. They are ordered by popularity, so you can start with the beginning of the list. I hope it'll help you
I don't have 50 list but I have solid 10 Social networking list hope it can help you: http://www.twitter.com http://www.myspace.com http://www.facebook.com http://www.bebo.com/ http://www.friendster.com/ http://www.Hi5.com/ http://www.orkut.com http://www.Zorpia.com http://www.Netlog.com http://www.propeller.com http://www.nettpro.com.au/
Advogato Amie Street ANobii aSmallWorld Athlinks Avatars United Badoo Bebo Bigadda BigTent Biip BlackPlanet Blogster Broadcaster.com Buzznet CafeMom Cake Financial Care2 Classmates.com Cloob CollegeBlender College Tonight CouchSurfing DailyBooth DailyStrength Decayenne deviantART Disaboom Dol2day DontStayIn Draugiem.lv Elftown Epernicus Eons.com Experience Project Exploroo Facebook Faceparty Faces.com Fetlife FilmAffinity FledgeWing Flixster Flickr Fotolog Foursquare Friends Reunited Friendster Frühstückstreff Fubar Gaia Online GamerDNA Gather.com Gays.com Geni.com Gogoyoko Goodreads Gossipreport.com Grono.net Habbo hi5 Hospitality Club Hyves Ibibo imeem IRC-Galleria italki.com InterNations Itsmy iWiW Jaiku JammerDirect.com kaioo Kaixin001 Kiwibox Last.fm LibraryThing lifeknot LinkedIn Listography LiveJournal Livemocha LunarStorm MEETin Meetup.com Meettheboss Mixi mobikade MocoSpace MOG MouthShut.com Multiply Muxlim MyAnimeList MyChurch MyHeritage MyLife MyLOL My Opera MySpace myYearbook Nasza-klasa.pl Netlog Nettby Nexopia NGO Post Ning Odnoklassniki OkCupid OneClimate OneWorldTV Open Diary Orkut OUTeverywhere PartnerUp Passportstamp Pingsta Plaxo Playahead Playboy U Plurk Present.ly Qapacity quarterlife Qzone Ravelry Renren ResearchGATE ReverbNation.com Ryze ScienceStage Scispace.net ShareTheMusic Shelfari Skyrock SocialVibe Sonico.com Soundpedia Stickam StudiVZ StumbleUpon Tagged TalentTrove Talkbiznow Taltopia Taringa! TravBuddy.com Travellerspoint tribe.net Trombi.com Tuenti Tumblr Twitter Vkontakte Vampirefreaks.com Viadeo Vox Wakoopa Wasabi WAYN WebBiographies WeOurFamily Windows Live Spaces WiserEarth Xanga XING Xt3 Yammer Yelp, Inc. Youmeo Zoo.gr
Go to socialmarker.com All sites that are listed there ate top ones. You can use this tool for awesome results
Here is the list 400+ Enjoy netscape.aol.com/ 9 slashdot.org/ 9 myweb.yahoo.com/ 8 video.google.com/ 8 blogspot.com 8 youtube.com/ 8 flickr.com/ 8 photobucket.com/ 8 digg.com 8 mystuff.ask.com/ 8 technorati.com/ 8 del.icio.us 8 stumbleupon.com/ 8 simile.mit.edu/ 8 furl.net 8 9rules.com/ 8 odeo.com/ 8 propeller.com 8 rojo.com/ 8 bookmarks.yahoo.com/ 7 myweb2.search.yahoo google.com/notebook 7 myaskjeeves.uk.ask.com/ 7 slide.com/ 7 esnips.com/ 7 twitter.com/home 7 wikia.com/wiki/Wikia 7 reddit.com 7 box.net/ 7 ifilm.com/ 7 blogcatalog.com/ 7 topix.net/blogs 7 meneame.net/ 7 taggle.de/ 7 fark.com 7 shutterfly.com/ 7 43things.com/ 7 metafilter.com/ 7 tags.library.upenn.edu/ 7 newsvine.com/ 7 matrix.msu.edu/ 7 techmeme.com/ 7 ma.gnolia.com 7 linuxquestions.org/7 rollyo.com/ 7 swik.net/ 7 icerocket.com/ 7 simpy.com 7 eventful.com/ 7 wikispaces.com/ 7 nowpublic.com/ 7 a9.com/-/home.jsp 7 librarything.com/ 7 frappr.com/ 7 blogpulse.com 7 tailrank.com 7 start.com/ 7 yoono.com/ 7 blogarama.com/ 7 de.lirio.us 7 citeulike.org/ 7 kuro5hin.org 7 connotea.org 7 kinja.com/ 7 claimid.com 7 krugle.com/ 7 clipfire.com/ 7 sitebar.org/ 7 jeteye.com/ 7 favorites.live.com/ 6 scuttle.org 6 segnalo.alice.it/? 6 buzznet.com/ 6 squidoo.com/ 6 fotki.com/us/ 6 quizilla.com/ 6 payperpost.com/ 6 pando.com/ 6 iq.lycos.co.uk/ 6 h2obeta.law.harvard.edu/ 6 allrecipes.com/ 6 ilike.com/ 6 mog.com/ 6 buddytv.com/ 6 blinklist.com 6 dzone.com/ 6 videosift.com/ 6 wetpaint.com/ 6 clipmarks.com/ 6 pligg.com/ 6 kaboodle.com/ 6 bluedot.us/front 6 jaiku.com/ 6 tradebit.com/ 6 wykop.pl/ 6 tec.fresqui.com/ 6 gather.com/ 6 spicypage.com/ 6 springwidgets.com/ 6 zaadz.com/ 6 spurl.net 6 diigo.com/ 6 mister-wong.com 6 blinkbits.com 6 netvouz.com 6 popurls.com 6 popurls.com/ 6 30boxes.com/6 blogmarks.net 6 zoomclouds.egrupos.net/ 6 blogcritics.org/ 6 wink.com/ 6 backflip.com/ 6 tagworld.com/ 6 linkarena.com/ 6 rateitall.com/ 6 shadows.com 6 bibsonomy.org/ 6 rawsugar.com 6 touchgraph.com/ 6 listible.com/ 6 bloghop.com 6 trailfire.com/ 6 plime.com 6 chipin.com/ 6 cocomment.com/ 6 searchles.com 6 43places.com/ 6 wikio.com/ 6 neato.co.nz/6 Protopage.com 6 clipclip.org/ 6 hugg.com 6 podcastingnews.com/ 6 web2list.com/ 6 spotplex.com 6 linkagogo.com 6 stylefeeder.com 6 dotnetslackers.com/ 6 listal.com/ 6 plazoo.com/ 6 lijit.com/ 6 my.foxcloud.com/ 6 feedmelinks.com/ 6 quintura.com/ 6 truthlaidbear.com/ minti.com/ 6 co.mments.com 6 artypapers.com/scribble/ 6 findory.com/ 6 listsofbests.com/ 6 newscloud.com/ 6 menuism.com/ 6 weblogalot.com/ 6 twittervision.com/ 6 adoppt.com/ 6 43people.com/ 6 allconsuming.net/ voo2do.com 6 askeet.com/ 6 linkfilter.net 6 clickcaster.com/ 6 vyew.com/ 6 suprglu.com/ 6 radar.net/ 6 Feedmarker.com 6 dev.upian.com/hotlinks/ 6 dissectmedicine.com/ 6 tagcloud.com/ 6 links2go.com 6 loudblog.de/ 6 rsscalendar.com/rss/ 6 cloudalicio.us/ 6 gibeo.net/ 6 trexy.com 6 frassle.net/ 6 beanrocket.com/ 6 openserving.com 6 nextaris.com/ 6 thumblicio.us 6 wurldbook.com/info/ 6 supcast.com/ 6 tagsy.com/ 6 nowthen.com/home 5 daytipper.com/ 5 archive.org/bookmarks bookmarks.ning.com/ 5 scribd.com/ 5 onlywire.com/ 5 spock.com/ 5 fanpop.com/ 5 shoutwire.com/ 5 allyourwords.com/ 5 boxxet.com/ 5 spicypage.com/ 5 stylehive.com/ 5 plugim.com/ 5 corank.com 5 linkedwords.com/ 5 my.xilinus.com 5 wists.com 5 socialporn.com/ 5 blogmemes.net/ 5 spotback.com 5 populair.eu/ 5 fazed.org 5 lifelogger.com/ icio.de/ 5 buddymarks.com/ 5 markaboo.com 5 jott.com/ 5 linkroll.com/ 5 tagtooga.com/ 5 gravee.com/ 5 marktd.com/ 5 myhq.com/ 5 linkatopia.com/ 5 butterflyproject.nl/ 5 MyBookmarks.com 5 looklater.com/ 5 bookmarktracker.com/ 5 otavo.com/ 5 thethingsiwant.com/ 5 mylinkvault.com/ 5 myvmarks.com/ 5 lilisto.com/ 5 millionsofgames.com/ 5 snipit.org/ 5 cl1p.net/ 5 motor.crispynews.com/ 5 hanzoweb.com/ 5 kick.ie/ 5 quasimondo.com/ 5 dark-i.com/ 5 myprogs.net/ 5 prefound.com/index.php 5 notefish.com/ 5 reader2.com/ 5 musipedia.org/ 5 memotoo.com/ 5 unalog.com/ 5 hyperlinkomatic.com/ 5 monkeyfilter.com/ 5 shorttext.com/ 5 populair.eu/ 5 givealink.org/ 5 iliketotallyloveit.com/ 5 phigita.net/ 5 plum.com/ 5 quotiki.com/ 5 taggly.com 5 mystickies.com/ 5 tipstrs.com/ 5 rrove.com/ 5 digglicious.com/ 5 memestreams.net/topics/ 5 thelostlinks.com/ 5 saveyourlinks.com/ 5 sync2it.com/ 5 favoor.com 5 fivelimes.com/ 5 open-tag-directory.org/ 5 web-feeds.com/ 5 kratia.com/ 5 krawlerx.com/ 5 winelog.net/ 5 gabbr.com/ 5 watvindenwijover.nl/ 5 crispynews.com/global 5 blummy.com/ 5 ambedo.com 5 blogoforum.com/ 5 jookster.com/ 5 wizlite.com/ 5 carnatic.com/www/ 5 orthodoxlinks.info/ 5 blog.cogenz.com/ 5 quickbrowse.com/ 5 indiamarks.com/ 5 blogniscient.com/ 5 supr.c.ilio.us/ 5 tagfacts.com/ 5 tagthe.net/ 5 copytalk.com/5 mecanbe.com/ 5 https://beta.yodio.com/5 spinspy.com/ 5 listmixer.com/ 5 openbm.de/ 5 getoutfoxed.com/home 5 wikalong.org/ 5 chuquet.com/ 5 feedalley.com/ 5 blogamp.com/ 5 netmite.com/ 5 dudecheckthisout.com/ 5 qvey.com/ 5 flexdirectory.com/ 5 dinnerbuzz.com/ 5 shufuni.com/ 4 bumpzee.com/ 4 startaid.com/ 4 ulinkx.com/ 4 eonsex.com/ 4 ispy.ucd.ie/ 4 i89.us/ 4 bmaccess.net/ 4 aboogy.com 4 blosker.com/ 4 oyax.com/ 4 changetolink.com/ 4 ineffabile.it/ 4 connectedy.com/ 4 getboo.com/ 4 a1-webmarks.com 4 sitejot.com/ 4 smarking.com/ 4 nabbr.com/ 4 urlex.info/ 4 syncone.net/ 4 evoca.com/4 30daytags.com/fresh 4 tag.zurpy.com/ 4 shoppersbase.com/ 4 zurpy.com/ 4 philoi.com/ 4 bla.st 4 complore.com 4 fungow.com/ 4 freelink.org/ 4 sparkhive.com/ 4 hypediss.com/ 4 imp.etuo.us/ 4 kidlinkz.com/ 4 tektag.com 4 snehah.com 4 ifaves.com 4 bookmark-manager.com/ 4 stanmx.com/sabrosus/ 4 gamingtags.com/ 4 hictu.com/login.php 4 lookmarks.com/ 4 juxel.com/ 4 ez4u.net 4 6-clicks.com/ 4 shooshshare.com/ 4 bookmach.com/ 4 allmyfavorites.net/ 4 cloudytags.com 4 commuteone.tann.com/ 4 linkblog.com.br/index.jsp 4 dohat.com 4 bookkit.com/ 4 ambedo.com/ 4 indiza.com/ 4 wobblog.com 4 soc.ialize.us/ 4 tutorialism.com/ 4 thinkpocket.com 4 portachi.com 4 cogdogblog.com/4 wazima.com/ 4 browsr.com/ 4 pixelmo.com 4 memfrag.com 4 tendango.com/ 4 eigology.com/dogear/ 4 googlecloud.com/ 4 mindpicnic.com/ 4 mywebdesktop.net/ 4 fooxx.com/ 4 namakkal.co.uk/ 4 funkycall.com/ 4 linklog.nl/ 4 smelis.com 4 cluebacca.com/ 4 maxigate.com/ 4 chugd.com/ 4 peercreations.com/ 4 urlblaze.com/ 4 q8-downloads.com/ 3 goodnotes.org/ 3 jef.free.fr/scuttle/ 3 wirefan.com/ 3 rate.theuncensored.com/ 3 ww2.ikeepbookmarks dfinitive.com/ 3 bookmark.it/ 3 mypip.com/home/ 3 turboclip.com/ 3 linkologia.pl/ 3 zlitt.com 3 socialbookmarking.org/ 3 webgoggles.com/ 3 meme-stream.com/ 3 2centsnews.com 3 yattle.com 3 tabmarks.com/ 3 aworldofhelp.com 3 gokodo.com/ 3 cosmosing.com/ 3 freshtribe.com/ 3 teachershare.org/openig/ 3 tag.schaufler.ch/ 3 ideanotes.de/textnotes/ 3 networkmenus.co.uk/ 3 eggkeg.com/ 3 myfavoritesonline.com/ 2 chipmark.com/ 2 tabber.org/ 2 newsweight.com 2 bloglot.com/tagging/ 2 4sur.com/ 0 upcoming.yahoo.com/ 0 c7.one.lv 0 pownce.com/ 0 sphinn.com/ 0 pixrat.com/ 0 thebeststuffintheworld 0 thoof.com 0 earthfrisk.com/index.php 0 socialmarker.com/ 0 changethis.com/ 0 creamaid.com/index.html 0 docstoc.com/betalogin0 bookmarks.blauerbote0 filmloop.myfabrik.com/ 0 igooi.com/ 0 oozm.com/index.php 0 snook.ca/snitter/ 0 yappd.com/ 0 favoritoo.com/ 0 brabblr.com/ 0 booktour.com/ 0 makethemostonline.com/ 0 heynielsen.com/ 0 maple.nu/ 0 thinkfreedocs.com/ 0 twitku.com/ 0 yoorl.com/ 0 blabb.com/ 0 tw3t.com/about 0 utterz.com/ 0 www2.mobypicture.com 0 nuharbor.com/welcome.do 0 sitetagger.com/ 0 yapme.com/ 0 podobo.com/ 0 blabto.com/ 0 onlineadvertisingnews.net/ 0 whynotad.com/ 0 tasty.pablotron.org/ 0 recipe-buzz.com 0 jobfu.org 0 gaddiposh.com/index.php 0 mysocialbookmarkers.com gnafi.com/ 0 tizags.com/ 0 egorcast.com/ 0 nouncer.com/ 0 Code (markup):
As there are a lot of social bookmarks, I suggest you to focus on dofollow social bookmarks because it can help you more to rank higher in search engines.