Tommy Robinson activist
Anyone with footage of the disturbance is urged to come forward.
Two police cars were damaged amid clashes between supporters of the far right activist and counter-demonstrators.
But Burger King has reminded everyone that it will still be selling them.
The 16-year-old said he and his family had been forced to move out of Huddersfield after they received threats.
Hope Not Hate is taking out Facebook ads and sending mail shots amid fears Robinson needs just 125k votes.
The 36-year-old could be sent back to jail if he is found in contempt.
"He is exploiting the pain of survivors and their families to fuel racist hate for his own gain."
"I am worried about me and my family being targeted."
UK police will be "stepping up" their presence at mosques as fears in the community have "significantly increased".
The social network said he had violated its rules.