@electronic{www.youtube.com,
   title       = {YouTube - Social Bookmarking in Plain English}, 
   url         = {http://www.youtube.com/watch?v=x66lV7GOcNU},
   biburl      = {https://puma.uni-kassel.de/url/8a706aca5e5f54150accd5aa0a795937/stumme},
   keywords    = {bookmarking folksonomies social tagging youtube},
   added-at    = {2008-04-29T15:55:46.000+0200},
   description = {},
   interhash   = {8a706aca5e5f54150accd5aa0a795937}, 
   intrahash   = {8a706aca5e5f54150accd5aa0a795937}
}

@electronic{www.prolearn-project.org,
   title       = {WP Social Software in PROLEARN - Network of Excellence in Professional Learning}, 
   url         = {http://www.prolearn-project.org/articles/wp15/index.html},
   biburl      = {https://puma.uni-kassel.de/url/794554ddcbed3e153ff01b268ae3f842/stumme},
   keywords    = {social folksonomies tagging software prolearn},
   added-at    = {2006-05-31T14:01:00.000+0200},
   description = {},
   interhash   = {794554ddcbed3e153ff01b268ae3f842}, 
   intrahash   = {794554ddcbed3e153ff01b268ae3f842}
}