Some people like to toss other peoples contribution around - making them hard to trace back. This helps:
- Wikimedia movement - for a visualization of the movement centered around people performing different roles
- Reach/Wikimedia users/Articles per number of speakers - which shows english isn't in the top-ten at all (Erik Zachte made a similar picture in his Wikimania presentation showing the number of Wikipedia editors per million speakers of a language slides 39-42 2]]).
- The leaking circle - interplay of several factors