K - L List of Web 2.0, Social Media, Networking, Tagging, Sharing Sites

http://www.keepvid.com/
http://www.kick.ie/kick/
http://www.kiko.com/
http://www.kinja.com/
http://www.kongregate.com/
http://www.krugle.com/
http://www.kuler.adobe.com/
http://www.labs.adobe.com/technologies/apollo/
http://www.labs.systemone.at/retrievr/
http://www.lala.com/
http://www.last.fm/
http://www.librarything.com/
http://www.lilisto.com/
http://www.linkagogo.com/
http://www.linkarena.com/
http://www.linkatopia.com/
http://www.linkedin.com/
http://www.linkee.digitta.com/
http://www.linkroll.com/
http://www.linksnarf.com/
http://www.lister.lilisto.com/
http://www.listible.com/
http://www.live.com/
http://www.livejournal.com/
http://www.local.live.com/
http://www.looklater.com/
http://www.lookmarks.com/