stackoverflow: 306
math: 219
superuser: 100
askubuntu: 79
electronics: 52
unix: 51
physics: 44
rpg: 42
serverfault: 33
drupal: 30
salesforce: 26
english: 26
mathoverflow.net: 24
security: 23
travel: 20
ja.stackoverflow: 19
codegolf: 19
dba: 19
crypto: 17
mathematica: 17
scifi: 16
puzzling: 16
wordpress: 15
softwarerecs: 15
magento: 14
gaming: 14
datascience: 14
ell: 14
academia: 13
softwareengineering: 13
workplace: 12
space: 12
sharepoint: 12
hinduism: 11
arduino: 11
politics: 10
meta: 10
ru.stackoverflow: 9