Social Networking/Bookmarking

Social Networking
http://www.classroom20.com/
http://www.ning.com/
https://mightybell.com/
http://www.nature.com/scitable
http://www.edmodo.com/
http://school20.ning.com/
http://www.socialgo.com/
http://www.linkedin.com/
http://www.facebook.com/
http://www.myspace.com/
http://www.friendster.com/
http://www.tribe.net/
http://communityengine.org/
http://buddypress.org/
http://www.boonex.com/dolphin
http://www.elgg.org/
http://www.onesite.com/
http://www.smallworldlabs.com/
http://www.poken.com/   -> New way of Social Networking by collecting people, places, and things

Social Bookmarking
http://pinterest.com/
http://zootool.com/
http://www.diigo.com/
http://www.delicious.com/
http://pinboard.in/
http://www.readitlater.com/
http://www.instapaper.com/
http://www.scoop.it/
http://www.pearltrees.com/
http://www.feedly.com/
https://posterous.com/
http://www.easybib.com/
http://magzinr.com/
http://www.wonderpage.com/
http://www.linkagogo.com/
http://www.netvouz.com/
http://www.startaid.com/
http://www.mister-wong.com/
http://ekstreme.com/socializer/
http://sandbox.self.li/bookmarklet-to-extension/   -> Bookmarks Generator
http://www.quixapp.com/   -> Bookmarks Generator
http://w-shadow.com/bookmarklet-combiner/   -> Bookmarks Generator
http://www.kmarked.com/   -> Bookmarks Search
http://marklets.com/   -> Bookmarks Search
http://learni.st/   Share What you know Pinterest Learnist Clipboard
https://clipboard.com/  Share What you know Pinterest Learnist Clipboard
http://www.symbaloo.com/   -> Visual Bookmarking