Kim Bruning, 12/11/2014 19:40:
I found this document/research paper on wikipedia user retention; FWIW
http://www-users.cs.umn.edu/~halfak/publications/The_Rise_and_Decline/
https://meta.wikimedia.org/wiki/Research:The_Rise_and_Decline http://thread.gmane.org/gmane.org.wikimedia.foundation/63549/focus=63576
Nemo