From Google translate of https://www.schwarzbuch-wikipedia.de/:
edited to remove wrong conclusion -t-Black Book Wikipedia
Bullying, defamation and misinformation in the online encyclopedia and what needs to be done about it now
With contributions from
Alex Baur, Günter Bechly, David Berger, Elias Erdmann, Markus Fiedler, Tomasz M. Froelich, Gunnar Melf Tobias Hamann (Wiki-Watch), Arne Hoffmann, Michael Klein, Walter Krämer, Michael Kühntopf, Heather Anne De Lisle, Andreas Mäckler, Katrin McClean, Hermann Ploppa, Lorenzo Ravagli, Helmut Roewer, Niki Vogt, Harald Walach, Torsten Walter, Volkmar Weiss, Werner (WikiMANNia), Jörg Wichmann, Wiki-Radar, Claus Wolfschlag
Wikipedia, the »encyclopedia of free content«, is one of the most visited websites worldwide – everyone knows it, everyone uses it. But what about the social media project? How true is the information contained, and how democratic is it?
Founder Jimmy Wales asserts that the online dictionary is almost immune to fake news. If you take a closer look, you will see that after about 20 years, not much remains of the once good idea. In the German-language Wikipedia, in any case, factual errors and disinformation as well as bullying and vandalism have spread, people, parties and companies are deliberately defamed – a reflection of the increasing radicalization of our Internet culture.
This documentation contains texts and interviews by and with experts as well as injured parties from politics, science and culture. Carefully documented case studies, court reports and bizarre style blossoms round off the picture. However, the book also shows solutions to the dilemma.