Activerain http://www.activerain.com/
Adlandpro http://www.adlandpro.com/
Adsocialnet http://www.adsocialnet.com/
Apsense http://www.apsense.com/invite/janelle (P)
Bebo http://www.bebo.com/
Bizpreneur http://bizpreneur.com/signup?friend=... (P)
Blogcatalog http://www.blogcatalog.com/
Cagora http://www.cagora.com/
Clipbook http://www.clipbook.com/
Cmu7 http://www.cmu7.com/index.php?L=user... (P)
DirectMATCHES http://www.directmatches.com/
Eqiyeah http://www.eqiyeah.com/
Facebook http://www.facebook.com/
Flixya http://www.flixya.com/referrer.php?r... (P)
Friendster http://www.friendster.com/
Friendswin http://www.friendswin.com/?sponsor=9721 (P)
Gather http://www.gather.com/ (P)
Giblink http://www.gibrs.com/Jeunelle (P)
Goalmigo http://www.goalmigo.com/
Hi5 http://www.hi5.com/
Homebizspace http://www.homebizspace.snappville.com/
Hoverspot http://www.hoverspot.com/
Imeem http://www.imeem.com/
Konnects http://www.konnects.com/
Kudzu http://kudzu.com/
Lazzeo http://lazzeo.com/signup/friend_Jeunelle (P)
Linkedin http://www.linkedin.com/
Livejournal http://www.livejournal.com/
Mashable http://www.mashable.com/
Metacafe http://www.metacafe.com (P)
Mybloglog http://www.mybloglog.com/
Myviewin http://www.myviewin.com/?idAff=902 (P)
Myspace http://www.myspace.com/jeunellefoster
Ning http://www.ning.com/
Ojeez http://www.ojeez.com/profile.aspx?Id... (P)
Our-Social http://www.our-social.com/
Partnerup http://www.partnerup.com/
Profileclub http://www.profileclub.com/
Qondio http://www.qondio.com/
Rotatrix http://www.rotatrixfriends.net/index... (P)
Ryze http://www.ryze.com/
Sales Spider http://salespider.com/signup.php?id=... (P)
Shustir http://www.shustir.com/
SocialGo http://www.socialgo.com/
Spock http://www.spock.com/
Stumbleupon http://www.stumbleupon.com/
TalkMoola http://www.talkmoola.com/profiles/100495 (P)
Trafficera http://www.trafficera.com/
Twitter http://www.twitter.com/
Uvme http://www.uvme.com (P)
Workdig http://www.workdig.com/
Xoost http://www.xoost.com/
ViralNetworks http://viralnetworks.com/a/25069
Yelp http://www.yelp.com/
Yuwie http://www.yuwie.com/yuwie.asp?r=12570 (P)
ZenZuu https://join.zenzuu.com/jeunelle (P)
Zimbio http://www.zimbio.com/
Zion5 http://www.zion5.com (P)
Zubby http://www.zubby.com/

This is a beginning list with more to come or added.
I will try to keep this list in Alphabetical order.

If any of you see a network that is not listed here, please add the link in the comments below and I will add it to this list later.

Contributions made by you will be most appreciated both by me and our Group members as this list is an effort to help us all from searching for these social networks the hard way. It can also be very time consuming.

Also please note that P=Paying.

This simply means that network is paying you to socialize and build your business.