Searching for some actual data on social media and citizen journalism in Poland I found the following useful links:
Nearly one year old, is this entry at readwriteweb.com about Poland's Top Web 2.0 Applications from Sebastian Kwiecien (Janmedia Interactive) .
Sebastian also shared a Presentation on Web 2.0 (in Polish language) here (PDF, July 2006)
Media Café Polska published on May 23, 2007 a list on Top Web 2.0 Apps and their "Polish Version's" (in Polish language).
I am still looking for more ... information and ideas are welcome!