@electronic{www.uba.uva.nl,
   title       = {Academic Social Referencing tools: a user trial with BibSonomy and Cite-U-Like organized by the Library of the University of Amsterdam}, 
   url         = {http://www.uba.uva.nl/social_referencing},
   biburl      = {https://puma.uni-kassel.de/url/dddefc72666c29b29c9f073f3f335a97/benz},
   keywords    = {bibsonomy citeulike studie uni_amsterdam vergleich},
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   intrahash   = {dddefc72666c29b29c9f073f3f335a97}
}

@electronic{blog.nielsen.com,
   title       = {Nielsen: Global Faces and networked places (pdf)}, 
   url         = {http://blog.nielsen.com/nielsenwire/wp-content/uploads/2009/03/nielsen_globalfaces_mar09.pdf},
   biburl      = {https://puma.uni-kassel.de/url/a6285650262d544f92c4725c66f2f351/benz},
   keywords    = {nielsen nutzung pdf social_networks soziale_netzwerke studie study},
   added-at    = {2011-02-04T16:07:45.000+0100},
   description = {},
   interhash   = {a6285650262d544f92c4725c66f2f351}, 
   intrahash   = {a6285650262d544f92c4725c66f2f351}
}

@electronic{www.heise.de,
   title       = {heise online - Umfrage: 30 Millionen Deutsche im Social Web}, 
   url         = {http://www.heise.de/newsticker/meldung/Umfrage-30-Millionen-Deutsche-im-Social-Web-954882.html},
   biburl      = {https://puma.uni-kassel.de/url/9faade34bf479b06998b08170c39897b/benz},
   keywords    = {deutschland germany social_networks soziale_netwerke studie umfrage},
   added-at    = {2011-02-04T16:07:38.000+0100},
   description = {Laut einer Forsa-Umfrage sind rund 30 Millionen Bundesbürger Mitglied mindestens einer Community. Dabei geht es den Nutzern in erster Linie um Kontaktpflege mit Freunden und Bekannten.},
   interhash   = {9faade34bf479b06998b08170c39897b}, 
   intrahash   = {9faade34bf479b06998b08170c39897b}
}