@electronic{de.nielsen.com,
   title       = {NMR Pressemeldung 09.06.2008 - Nielsen Mobile}, 
   url         = {http://de.nielsen.com/news/NMRPressemeldung_09.06.2008-NielsenMobile.shtml},
   biburl      = {https://puma.uni-kassel.de/url/28a41fd98c8985f2c9b424186510ff11/benz},
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@electronic{de.nielsen.com,
   title       = {Nielsen Pressemeldung 04.08.2009 - Twitter}, 
   url         = {http://de.nielsen.com/news/NielsenPressemeldung04.08.2009-Twitter.shtml},
   biburl      = {https://puma.uni-kassel.de/url/fb256b579a1f2e993a2bd331757f00db/benz},
   keywords    = {nielsen trend twitter},
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@electronic{blog.nielsen.com,
   title       = {Social Networkers With Multiple Profiles Skew Young, Tech-Savvy | Nielsen Wire}, 
   url         = {http://blog.nielsen.com/nielsenwire/online_mobile/social-networkers-with-multiple-profiles-skew-young-tech-savvy/},
   biburl      = {https://puma.uni-kassel.de/url/d005efa94981f1794849b7014c8bfc56/benz},
   keywords    = {facebook nielsen nutung social_networking social_networks},
   added-at    = {2011-02-04T16:07:45.000+0100},
   description = {According to Nielsen’s recent Global Faces And Networked Places report, the biggest increase in unique visitors to Member Community Web sites during 2008},
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@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},
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