"If you are guilty of racist abuse online on football, then you will not be going to the match,'' Johnson said. "No ifs, no buts, no exemptions, no excuses."
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Twitter fails to respond to women's reports of online abuse and harassment, Amnesty International found.
"Whether shouted in their face on the street, daubed on a wall or tweeted into their living room, hateful abuse can have a devastating impact on victims."
The Marine Corps has been rattled by a scandal involving a private Facebook group and its surreptitious distribution of explicit images of women in the armed forces.
The U.S. study also showed that more younger people had experienced abusive behavior.
Bullying remains one of the most common reasons why children contact the U.K. helpline.
Party's ruling committee agreed to introduce new social media pledge for members.
Digital rights groups are worried that the deal gives the four companies excessive power.