Top 10 users by edits per day, counting only edits to the body of a post by another user:

Michael Hardy
Normal Human
user26857
Harish Chandra Rajpoot
wythagoras
George Simpson
N. F. Taussig
Martin Sleziak
Daniel W. Farlow
Davide Giraudo

October is traditionally the busiest month of the second half of every year. Let's compare the visit numbers from Quantcast:

October 2014: 2,461,388 monthly uniques
October 2015: 3,857,736 monthly uniques

That's 57% growth in a year.