1. 9.09   Artw
2. 8.51   The Whelk
3. 6.88   EmpressCallipygos
4. 6.06   hippybear
5. 5.98   cortex
6. 5.09   jessamyn
7. 5.06   delmoi
8. 4.84   praemunire
9. 4.77   homunculus
10. 4.59   empath
11. 4.58   filthy light thief
12. 4.48   Anonymous
13. 4.31   flabdablet
14. 4.15   Brandon Blatcher
15. 4.1   klangklangston
16. 3.96   ericb
17. 3.94   Miko
18. 3.86   Justinian
19. 3.84   DU
20. 3.81   rtha
21. 3.59   Sys Rq
22. 3.57   griphus
23. 3.55   Sara C.
24. 3.5   zarq
25. 3.49   languagehat
26. 3.49   jonmc
27. 3.31   Eyebrows McGee
28. 3.31   feckless fecal fear mongering
29. 3.28   Etrigan
30. 3.24   amberglow
31. 3.23   Thorzdad
32. 3.2   Dip Flash
33. 3.19   thelonius
34. 3.16   flapjax at midnite
35. 3.15   GenjiandProust
36. 3.11   corb
37. 3.11   five fresh fish
38. 3.1   GuyZero
39. 3.02   koeselitz
40. 3.02   The Underpants Monster
41. 3.01   roomthreeseventeen
42. 2.92   LobsterMitten
43. 2.88   Mitheral
44. 2.87   phunniemee
45. 2.87   Going To Maine
46. 2.84   Frowner
47. 2.83   mandolin conspiracy
48. 2.83   poffin boffin
49. 2.81   philip-random
50. 2.81   rhizome
51. 2.8   zachlipton
52. 2.79   theora55
53. 2.76   Pope Guilty
54. 2.76   KokuRyu
55. 2.74   elizardbits
56. 2.72   JHarris
57. 2.67   Ruthless Bunny
58. 2.64   shakespeherian
59. 2.61   DarlingBri
60. 2.59   desjardins
61. 2.58   the man of twists and turns
62. 2.57   The_Vegetables
63. 2.57   Fizz
64. 2.57   Potomac Avenue
65. 2.55   Greg_Ace
66. 2.53   ROU_Xenophobe
67. 2.51   Astro Zombie
68. 2.49   box
69. 2.49   mathowie
70. 2.48   They sucked his brains out!
71. 2.43   dhartung
72. 2.43   loquacious
73. 2.43   octothorpe
74. 2.4   stavrosthewonderchicken
75. 2.33   oneswellfoop
76. 2.32   UbuRoivas
77. 2.29   ArbitraryAndCapricious
78. 2.29   muddgirl
79. 2.29   Ironmouth
80. 2.27   infini
81. 2.27   zombieflanders
82. 2.26   caddis
83. 2.26   mumimor
84. 2.24   It's Raining Florence Henderson
85. 2.24   wenestvedt
86. 2.23   pyramid termite
87. 2.22   ThePinkSuperhero
88. 2.22   Cool Papa Bell
89. 2.22   y2karl
90. 2.22   clavdivs
91. 2.21   Mister_A
92. 2.21   tonycpsu
93. 2.2   smackfu
94. 2.18   kirkaracha
95. 2.16   soren_lorensen
96. 2.16   Halloween Jack
97. 2.16   Joe in Australia
98. 2.15   Drinky Die
99. 2.14   jenfullmoon
100. 2.13   katra

1. 2167   Fizz
2. 2055   filthy light thief
3. 1688   the man of twists and turns
4. 1515   homunculus
5. 1505   hippybear
6. 1430   Artw
7. 1329   The Whelk
8. 1298   mathowie
9. 1092   chavenet
10. 1061   MartinWisse
11. 1036   Johnny Wallflower
12. 1020   fearfulsymmetry
13. 1001   Etrigan
14. 976   zarq
15. 951   kliuless
16. 894   Kattullus
17. 742   flapjax at midnite
18. 737   roomthreeseventeen
19. 730   stbalbach
20. 714   y2karl
21. 650   adamvasco
22. 650   Brandon Blatcher
23. 643   Postroad
24. 627   jonson
25. 598   Chrysostom
26. 596   infini
27. 568   Wordshore
28. 560   griphus
29. 556   netbros
30. 543   quin
31. 542   nickyskye
32. 526   Potomac Avenue
33. 524   storybored
34. 518   Going To Maine
35. 517   madamjujujive
36. 509   growabrain
37. 481   crunchland
38. 470   MiguelCardoso
39. 467   joseph conrad is fully awesome
40. 464   reenum
41. 442   oneswellfoop
42. 434   Room 641-A
43. 427   gman
44. 413   empath
45. 407   JHarris
46. 387   brundlefly
47. 385   kirkaracha
48. 381   Steven Den Beste
49. 380   spamandkimchi
50. 374   dhruva
51. 373   MovableBookLady
52. 372   ellieBOA
53. 367   OmieWise
54. 366   blahblahblah
55. 365   brainwane
56. 359   ChuraChura
57. 359   clawsoon
58. 358   box
59. 350   owillis
60. 347   XQUZYPHYR
61. 343   feelinglistless
62. 340   not_on_display
63. 339   Joe Beese
64. 338   Kitteh
65. 331   chunking express
66. 329   amberglow
67. 327   NoxAeternum
68. 323   mandolin conspiracy
69. 323   Wolfdog
70. 322   plep
71. 318   not_the_water
72. 315   Iridic
73. 313   skallas
74. 313   AlonzoMosleyFBI
75. 312   ericb
76. 312   hama7
77. 312   Foci for Analysis
78. 311   twoleftfeet
79. 311   HuronBob
80. 311   srboisvert
81. 308   cortex
82. 308   codacorolla
83. 305   jbickers
84. 298   divabat
85. 297   josher71
86. 297   Cash4Lead
87. 295   Miko
88. 295   wendell
89. 294   Blasdelb
90. 291   loquacious
91. 288   semmi
92. 287   Trurl
93. 287   adrianhon
94. 287   caddis
95. 287   Horace Rumpole
96. 284   dobbs
97. 284   mediareport
98. 281   MonkeyToes
99. 281   Chocolate Pickle
100. 279   Anonymous

1. 55500   Artw
2. 36270   The Whelk
3. 36049   homunculus
4. 33791   delmoi
5. 29068   hippybear
6. 23518   ericb
7. 23028   EmpressCallipygos
8. 22246   Justinian
9. 21507   jonmc
10. 21397   empath
11. 21244   DU
12. 19236   amberglow
13. 18608   five fresh fish
14. 18386   filthy light thief
15. 17432   JHarris
16. 16967   zachlipton
17. 16712   klangklangston
18. 15698   Sys Rq
19. 15631   dhartung
20. 15431   Pope Guilty
21. 15264   srboisvert
22. 15177   Thorzdad
23. 15077   octothorpe
24. 14846   kirkaracha
25. 14690   GuyZero
26. 14589   koeselitz
27. 14589   cortex
28. 14471   GenjiandProust
29. 14312   Brandon Blatcher
30. 14079   zarq
31. 13961   languagehat
32. 13944   ROU_Xenophobe
33. 13795   flapjax at midnite
34. 13724   clavdivs
35. 13650   pyramid termite
36. 13603   roomthreeseventeen
37. 13601   Miko
38. 13223   rtha
39. 13122   oneswellfoop
40. 13019   Nelson
41. 12875   thelonius
42. 12736   Etrigan
43. 12728   mrgrimm
44. 12685   flabdablet
45. 12552   philip-random
46. 12528   griphus
47. 12478   Joe in Australia
48. 12473   y2karl
49. 12450   Mitheral
50. 12284   Greg_Ace
51. 12008   saulgoodman
52. 12003   Smedleyman
53. 11991   Astro Zombie
54. 11950   Halloween Jack
55. 11802   Chrysostom
56. 11796   shakespeherian
57. 11561   loquacious
58. 11486   Talez
59. 11279   Fizz
60. 11203   KokuRyu
61. 10854   straight
62. 10850   emjaybee
63. 10844   The Card Cheat
64. 10609   tonycpsu
65. 10595   acb
66. 10538   zombieflanders
67. 10398   corb
68. 10394   infini
69. 10387   elizardbits
70. 10384   T.D. Strange
71. 10377   clawsoon
72. 10314   Joey Michaels
73. 10214   mediareport
74. 10199   pracowity
75. 10170   jeffburdges
76. 10091   yoink
77. 9973   Potomac Avenue
78. 9966   Faint of Butt
79. 9878   ricochet biscuit
80. 9835   quin
81. 9770   smackfu
82. 9711   stavrosthewonderchicken
83. 9703   muddgirl
84. 9614   Going To Maine
85. 9576   chavenet
86. 9537   Ironmouth
87. 9515   Mister_A
88. 9514   UbuRoivas
89. 9425   ChurchHatesTucker
90. 9347   George_Spiggott
91. 9326   brundlefly
92. 9262   feckless fecal fear mongering
93. 9187   Frowner
94. 9132   poffin boffin
95. 9032   drezdn
96. 9026   caddis
97. 9020   Eyebrows McGee
98. 8977   Dip Flash
99. 8967   quonsar
100. 8942   eriko

1. 528   mathowie
2. 252   cortex
3. 197   Eyebrows McGee
4. 173   MiguelCardoso
5. 125   jessamyn
6. 124   taz
7. 110   Fizz
8. 109   WCityMike
9. 105   pb
10. 105   signal
11. 101   stavrosthewonderchicken
12. 79   scarabic
13. 79   stupidsexyFlanders
14. 78   dobbs
15. 77   feelinglistless
16. 74   empath
17. 74   wendell
18. 71   ParisParamus
19. 71   grumblebee
20. 68   timeistight
21. 68   sgt.serenity
22. 66   desjardins
23. 64   drezdn
24. 63   crunchland
25. 61   ThePinkSuperhero
26. 61   zarq
27. 60   Keyser Soze
28. 59   griphus
29. 59   Brandon Blatcher
30. 58   rcade
31. 58   filmgeek
32. 57   LobsterMitten
33. 54   oissubke
34. 54   brownpau
35. 53   twine42
36. 53   Grod
37. 53   loup
38. 53   y2karl
39. 52   Artw
40. 51   interrobang
41. 50   anastasiav
42. 49   loquacious
43. 49   mr_crash_davis
44. 48   Kickstart70
45. 47   SpecialK
46. 46   vacapinta
47. 45   PrinceValium
48. 45   geoff.
49. 45   Eideteker
50. 45   mecran01
51. 44   wheelieman
52. 44   riffola
53. 43   dash_slot-
54. 43   ocherdraco
55. 43   ZachsMind
56. 42   Mitheral
57. 42   delmoi
58. 42   mkultra
59. 42   o2b
60. 41   carsonb
61. 40   klangklangston
62. 40   Irontom
63. 40   moz
64. 40   machaus
65. 40   Shane
66. 40   snsranch
67. 39   me3dia
68. 39   five fresh fish
69. 39   bigmusic
70. 39   Effigy2000
71. 39   parmanparman
72. 39   owillis
73. 38   orthogonality
74. 38   armoured-ant
75. 38   Voyageman
76. 38   allkindsoftime
77. 38   orange swan
78. 38   boo_radley
79. 37   blue_beetle
80. 37   Rhaomi
81. 37   Mayor Curley
82. 37   andrew cooke
83. 37   jonson
84. 37   amberglow
85. 37   jbickers
86. 36   Lynsey
87. 36   pjern
88. 36   Mo Nickels
89. 36   Afroblanco
90. 36   Wordshore
91. 36   Miko
92. 36   monju_bosatsu
93. 36   JHarris
94. 36   NortonDC
95. 36   Smart Dalek
96. 36   Going To Maine
97. 36   grouse
98. 36   bonaldi
99. 35   caitlinb
100. 35   Deathalicious

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.