Huh. So yeah, this does appear to be a pretty decent heuristic.
Here's the outcome of suggested edits with email-like comments network-wide for the past 90 days:
R A Site Name
199 0 StackOverflow
26 0 SuperUser
71 0 ServerFault
10 0 Cooking
14 0 Home Improvement
3 0 Game Developers
116 0 Gaming
3 0 GIS
18 0 Mathematics
5 0 Photography
5 0 Statistical Analysis
4 0 Web Apps
14 0 Webmasters
172 0 Apple
10 0 Theoretical Computer Science
41 0 English Language and Usage
21 0 Personal Finance and Money
1 0 Role-playing Games
14 0 TeX - LaTeX
77 0 Ubuntu
34 0 Unix and Linux
72 0 WordPress
4 0 Programmers
3 0 OnStartups
31 0 Homebrew
3 0 IT Security
26 0 Writers
8 0 Electronics and Robotics
6 0 Graphic Design
1 0 Database Administrators
15 0 Science Fiction
3 0 Code Review
3 0 Code Golf
9 0 Drupal Answers
2 0 SharePoint
33 0 Musical Practice and Performance
1 0 Japanese Language and Usage
2 0 Gardening and Landscaping
8 0 Travel
3 0 Signal Processing
60 0 Bitcoin
1 0 LEGO®
2 0 Spanish Language and Usage
12 0 Movies
1 0 Martial Arts
6 0 Sports
5 0 Raspberry Pi
25 0 Salesforce
12 0 Patents
2 0 User Experience
1 0 Robotics
13 0 ExpressionEngine
15 0 Magento
6 0 English Language Learners
8 0 Tridion Stack Exchange
14 0 Blender Stack Exchange
10 0 MathOverflow
We just rolled out a more effective spam-fighting system for suggested edits, so I would like to wait and see how much these numbers drop before going further... But this does seem like a simple and effective place to attack.
