People who are always nice when in a group or at work or school and always shaking hands and smiling. When they get home they start their assaults on mankind via blogs, posts, and other internet media outlets with cursing, racial indignation, name calling and general harassment of anyone and everyone. Only to return to work, school, etc. smiling and maintaining their normal sleeper cell persona.
Friend - Hey man how are you?
Social Terrorist - Awesome how about you?
Friend - Did you see on the internet where a guy robbed a bank killed someone and only got 5 years?
Social Terrorist - No, that's a shame but I don't really look at the internet when I'm home I have so much more to do than stay online (secretly can't wait to get home and terrorize everyone he can find on the subject who does not share his view).