Krzysztof Gajewski, 23/06/2015 16:46:
I wonder if you know if somebody verified and / or further researched Aaron Swartz's thesis on structure of Wikipedia participation. You can find it here: http://www.aaronsw.com/weblog/whowriteswikipedia
http://wikipapers.referata.com/wiki/Authorship has some related studies, though the question can't have a clearcut answer.
Nemo