Referral links (where you derive some sort of financial or other benefit) such as Cyber-war, Outwar, plus all other variants. In addition, certain sites are expressly prohibited, specifically (but not exclusively) 4chan, kevan.org, ebaumsworld, albinoblacksheep, plasticnipple, Encyclopaedia Dramatica, A Voice For Men, and Fred Phelps' godhates<group> hate-mongering sites are not allowed. Use discretion when linking to another site.
Why is the kevan site banned? Also ebaumsworld and albinoblacksheep.