Forbidden:
Incent traffic
Discord
Frauds
Doorways
Facebook
Google search
SMS
Push traffic
Toolbar
Craiglist
Co-registrations
Email traffic
Viral traffic
Brand bidding
Torrent
Subnetworks
Rebrokering
Use pics of celebrities, actors/actress or any other famous people on banners, pre-landers
Keywords
Misspellings
Typos
Social networks: publics, games, applications
Click under
Pop under
Chat traffic
In-app traffic