Affinity Engines,
Amigos.com,
href="http://www.asiafriendfinder.com/" target="_blank">AsiaFriendFinder,
href="http://www.backwash.com/magazine.php" target="_blank">Backwash,
href="http://backwashpets.com/magazine.php" target="_blank">Backwash for Pets,
href="http://www.buddybridge.com/" target="_blank">BuddyBridge,
target="_blank">BuddyZoo, Buzznet,
Chia Friend,
href="http://www.classmates.com/" target="_blank">Classmates.com,
href="http://www.communityzero.com/" target="_blank">Community Zero,
href="http://www.fastcompany.com/cof/" target="_blank">Company of Friends,
href="http://www.theconneck.com/" target="_blank">The Conneck,
href="http://www.contactnetworkcorp.com/" target="_blank">Contact Network,
href="http://www.corporatealumni.com/" target="_blank">Corporate Alumni,
href="http://www.delphiforums.com/" target="_blank">Delphi Forums,
title="Dogster" target="_blank">Dogster,
target="_blank">Dude Check This Out!, easeek,
ecademy,
title="eConozco.com" target="_blank">eConozco.com,
target="_blank">eFriendsnet,
target="_blank">8minuteDating, Eliyon,
enCentra,
target="_blank" title="EntreMate">EntreMate,
target="_blank">Eurekster!,
target="_blank">everyonesconnected, Evite,
First Tuesday,
FriendFan.com,
href="http://friendfinderinc.com/corporate/" target="_blank">FriendFinder,
href="http://friendity.de/index.jsp" target="_blank">Friendity,
href="http://www.friendsurfer.com/" target="_blank">Friend Surfer,
href="http://www.friendsreunited.com/" target="_blank">Friends Reunited,
href="http://www.friendster.com/index.jsp" target="_blank">Friendster,
href="http://www.friendzy.com/" target="_blank">Friendzy,
title="Funchain.com">Funchain.com,
target="_blank">GermanFriendFinder, Globe
Alive, GoingProfessional,
gradFinder,
href="http://www.growingco.com/" target="_blank">Growth Company,
target="_blank">HeiYou, HelloWorld,
hipster,
href="http://www.huminity.com/" target="_blank">Huminity,
href="http://www.imnotfromhere.com/" target="_blank">I’m Not From Here,
href="http://www.indianfriendfinder.com/" target="_blank">IndianFriendFinder,
href="http://www.interfacesoftware.com/products/interaction/ia_summary.cfm" target="_blank">InterAction,
ItsNotWhatYouKnow,
KnowMates,
href="http://lianqu.com.cn/" target="_blank">LianQu,
target="_blank">LinkedIn, Living
Directory, Love.com,
href="http://www.thelunchclub.net/" target="_blank">The Lunch Club NYC,
href="http://match.com/" target="_blank">Match.com,
target="_blank">matcheroo, Mediabistro,
MeetUp,
title="MixerMixer" target="_blank">MixerMixer,
href="http://network.monster.com/NewEntry.aspx?mode=one" target="_blank">Monster Networking,
mrNeighborhood,
href="http://www.myematch.com/" target="_blank">MyEMatch,
target="_blank">NetMiner,
target="_blank">Netmodular Community,
target="_blank">Netparty,
target="_blank">Netplaya Burning Man Community,
href="http://www.networkingforprofessionals.com/" target="_blank">Networking For Professionals,
href="http://www.nerve.com/" target="_blank">Nerve,
href="http://www.onlinebusinessnetworking.com/" target="_blank">Online Business Networking Resource,
The Opinion Exchange,
orkut,
href="http://www.paljunction.com/" target="_blank">PalJunction,
target="_blank">Passion.com, peeps
nation, PowerMingle,
qpengyou,
href="http://www.rateordate.com/" target="_blank">RateOrDate,
href="http://www.realcontacts.com/" target="_blank">RealContacts,
title="RedDate.com" target="_blank">RedDate.com,
target="_blank">ReferNet, RepCheck,
Ringo,
target="_blank">Ryze,
target="_blank">Salesforce.com,
target="_blank">SeniorFriendFinder,
target="_blank">Shortcut,
target="_blank">Silicon Valley Pipeline,
target="_blank">Small World Project,
target="_blank">Social Circles, Social
Grid, SocialTree,
href="http://www.sona.com/" target="_blank">Sona,
target="_blank">The Spark, Spoke
Software, StumbleUpon,
target="_blank">Sullivan Executive Networking Community,
target="_blank">Talk City, TENG,
There,
href="http://www.emode.com/" target="_blank">Tickle by Emode,
href="http://cluster.tribe.net/tribe/servlet/" target="_blank">Tribe.net,
href="http://www.udate.com/" target="_blank">uDate.com,
target="_blank">UUFriends, Visible
Path, Wallop,
title="WhizSpark" target="_blank">WhizSpark,
target=" _blank=">WisdomBuilder, WiW,
WorldShine,
YeeYoo,
href="http://www.yoyonet.cn/" target="_blank">YOYO,
target="_blank">Zdarmanet, and
target="_blank">Zerodegrees.
]. One could, of course, end up with some big winners anyway, if there are increasing returns on scale of the networks, they are competing for the same users, and there are substantial user switching costs. So far, my own nibbling around the domain, and scanning the comments of a lot of others, doesn't lead me to believe that many of these players have sufficient user value to create such a network effort. (With the possible exception of Friendster.)