2005
![](http://blogmarks.net/screenshots/2005/09/12/96f696639c7cbd4b11c8c272c89153ed.png)
CollaborativeRank -- del.icio.us search engine
![](http://blogmarks.net/screenshots/2005/06/13/788d3fd06c55583843e43be9fb0bb471.png)
Gataga - Social bookmark search and exploration engine
![](http://blogmarks.net/screenshots/2005/06/13/788d3fd06c55583843e43be9fb0bb471.png)
Gataga - Social bookmark search and exploration engine
![](http://blogmarks.net/screenshots/2006/12/21/297d937f941a701cb8d275280ce1bbc7.png)
Simpy - tagging, social bookmarking and personal search engine
1989
![](http://blogmarks.net/screenshots/2008/04/06/549d90d8d7a2c13e234e129e28523acc.jpg)
Swicki-SwickiEureksterCom
![](http://blogmarks.net/avatar?url=http%3A%2F%2Funscharf.at%2Fd%2F23508-1%2FMartinWaissOkt2006Thumb.jpg)