Jonathan Morgan, 27/10/2015 18:53:
Either way, it's safe to say that the total number is in the millions.
+1. It's correct to say that millions have edited Wikipedia, and probably editors for Wikimedia projects are in the order of 10^7. There is no information gain in trying to give more precise numbers.
The point here is very simple, Wikimedia wikis are the most massively multi-author work ever created. Sure, the number may be misleading if associated to different claims.
Nemo