1. 9.09   Artw
2. 8.51   The Whelk
3. 6.88   EmpressCallipygos

1. 2167   Fizz
2. 2055   filthy light thief
3. 1688   the man of twists and turns

1. 55500   Artw
2. 36270   The Whelk
3. 36049   homunculus

1. 528   mathowie
2. 252   cortex
3. 197   Eyebrows McGee

Updated Apr 11, 2024

Excellent question. It is simply the sum of all the times a user has posted on Metafilter (comments or posts in any section of MeFi) divided by the number of days they have been a member.

Tamim's user profile discusses the idea and while reading this discussion I saw moz's reference to tamim's user page. After reading that and seeing tamim's suggestion, I wrote a quick script to do it. If you see any problems please let me know.