Update stackexchange sub-list

data/stackexchange

@@ -1,4 +1,7 @@
-# Reference: 'https://stackexchange.com/sites'
+# References:
+# https://stackexchange.com/sites
+# https://meta.stackexchange.com/questions/81379/can-we-have-a-list-of-all-the-stack-exchange-domains-somewhere-for-firewall-pur
+
 stackexchange.com
 stackoverflow.com
 serverfault.com
@@ -7,3 +10,12 @@ superuser.com
 stackapps.com
 mathoverflow.net
 sstatic.net
+mathoverflow.net
+blogoverflow.com
+stackapps.com
+stackmod.blog
+stackoverflow.blog
+stackoverflowbusiness.com
+tex-talk.net
+thesffblog.com
+stacksnippets.net