ALT: a woman is pointing her finger at the word think about it

ALT: a woman is talking on a cell phone and says " are you kidding me right now "

ALT: a bald man is sitting in a chair with the words `` shouldn 't you be sleeping grandpa '' written on the screen .

ALT: a man in a suit is covering his face with his hands and the words cool cool cool cool cool cool cool cool super cool

ALT: a close up of a man 's face with a serious look on it .

ALT: elmo from sesame street says " you 're an idiot " in white letters

Alt: a man in a captain america costume is standing in front of a blue suv

Alt: a man with glasses and a mustache is saying oh ninja please

ALT: a man wearing a yellow jacket and a yellow scarf is making a funny face .

ALT: a little girl is crying and smiling while wearing a tie and a bow .

Anonymity has long been a tactic used by extremists to spread their ideology while avoiding social consequences, from Klansmen hoods to online pseudonyms.

Alt: a woman in a suit and tie is saying i 'm not saying burn it down

ALT: a woman is sitting in a room with her eyes closed and a blurry background .

ALT: a woman says " i know , i know " with her mouth wide open

ALT: a woman holding a sign that says heavens way

ALT: a woman says you know it 's true in a purple shirt

ALT: snoop dogg is wearing a hat , glasses , a necklace , and a black shirt .