math: 241
stackoverflow: 125
askubuntu: 52
physics: 50
unix: 34
superuser: 34
electronics: 32
serverfault: 30
mathoverflow.net: 29
rpg: 27
dba: 17
wordpress: 14
puzzling: 14
android: 13
salesforce: 13
english: 13
worldbuilding: 11
datascience: 11
diy: 11
ell: 10
gaming: 10
pets: 10
codegolf: 10
es.stackoverflow: 9
cs: 9
academia: 9
webapps: 9
scifi: 8
mathematica: 8
materials: 8
skeptics: 8
emacs: 7
politics: 7
sharepoint: 7
apple: 7
raspberrypi: 7
money: 6
hardwarerecs: 6
ham: 6
ja.stackoverflow: 6