Dataset Open Access
Sun, Jun; Kunegis, Jérôme
User interaction networks of Wikipedia of 28 different languages. Nodes (orininal wikipedia user IDs) represent users of the Wikipedia, and an edge from user A to user B denotes that user A wrote a message on the talk page of user B at a certain timestamp.
More info: http://yfiua.github.io/academic/2016/02/14/wiki-talk-datasets.html