@electronic{tagdef.com,
   title       = {Definition of hashtags, the easy hashtag directory}, 
   url         = {http://tagdef.com/},
   biburl      = {https://puma.uni-kassel.de/url/4006a326755d20647fa2fcc19154e7f5/stumme},
   keywords    = {# hashtag twitter},
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@electronic{www.tagesschau.de,
   title       = {Nachrichten von der Twitterfarm: Ergänzung - aber kein Ersatz | tagesschau.de}, 
   url         = {http://www.tagesschau.de/ausland/twitterfarm102.html},
   biburl      = {https://puma.uni-kassel.de/url/0903aee0765483d8a3d595c097d67b8c/stumme},
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@electronic{www.tweetfeel.com,
   title       = {tweetfeel Twitter Sentiment - Real-time Twitter search with feelings towards your favorite brand, celebrity or anything else. (Tweet Feel)}, 
   url         = {http://www.tweetfeel.com/},
   biburl      = {https://puma.uni-kassel.de/url/b105101500365e177639a17178b30176/stumme},
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@electronic{parteigezwitscher.de,
   title       = {Parteigezwitscher - Die politische Stimmung auf twitter}, 
   url         = {http://parteigezwitscher.de/},
   biburl      = {https://puma.uni-kassel.de/url/92f1e52435fee4662ff491e5bca25328/stumme},
   keywords    = {everyaware mood social stimmung twitter wahl web web2.0 web20},
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@electronic{www.twibble.de,
   title       = {twibble :: a location aware twitter client for Mac, Windows, Symbian (Blackberry, Nokia, and more)}, 
   url         = {http://www.twibble.de/},
   biburl      = {https://puma.uni-kassel.de/url/d0532b863b568909e2169c25f50e6628/stumme},
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@electronic{www.twittermap.de,
   title       = {twittermap - Who twitters where}, 
   url         = {http://www.twittermap.de/},
   biburl      = {https://puma.uni-kassel.de/url/db13e5c6b8f4af36a9efe1a87a90817d/stumme},
   keywords    = {everyaware geo geolocation location map twitter},
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@electronic{www.gpsbusinessnews.com,
   title       = {Twitter to get geolocation}, 
   url         = {http://www.gpsbusinessnews.com/Twitter-to-get-geolocation_a1688.html},
   biburl      = {https://puma.uni-kassel.de/url/b1762d9edf72e6df9658208e17029874/stumme},
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