The MP leading efforts to combat online antisemitism has attacked internet companies for their "insufficient" response to the abuse.
John Mann said firms including Twitter and Facebook had not taken their responsibilities seriously and that "something is significantly wrong" with their approach to tackling hatred on their sites.
Twitter has repeatedly failed to answer the JC's questions on how it dealt with the abuse of Britain's youngest Jewish MP, Luciana Berger.
Despite assurances that the company took the matter seriously, there was no response.
Mr Mann, chair of the All-Party Parliamentary Group Against Antisemitism, told the Commons on Tuesday that the internet giants were not taking practical steps to tackle the problem.
It is possible to block abuse, but they won't do it
Community Security Trust communications director Mark Gardner said: "If any good comes from this awful hounding of Luciana Berger, then it will be to bring politicians and lawmakers to better realise that CST and many other anti-racist groups are entirely correct to insist that social media platforms are brought into line with the rest of society when publishing or hosting vile hatred."
Jonathan Sacerdoti, a spokesman for the Everyday Antisemitism project which collects examples of online abuse and the Campaign Against Antisemitism, said: "We have people coming to us continuously with reports of abuse.
"There's a whole generation of the Jewish community who do not use Facebook and Twitter and do not understand the extent of this abuse.
One IT expert consulted by the JC said it was technologically possible for Twitter and other sites to proactively block abuse.
"They can do it, but they won't. The technology exists to stop abuse and profanity or anything like that from appearing. Lots of companies offer that sort of software and firewalls," he said.
"It's not down to the cost. I think the willingness just isn't there. Firms like Twitter do not want to be accused of censoring."
Patricia Cartes, Twitter's head of global safety outreach, said in a general update on abuse on the site, seen by the JC, that extra staff had been used to handle reports of abuse and a taskforce had been set up.
"A globally distributed team at Twitter reviewed abusive accounts around the clock regarding the specific situation that has unfolded in recent weeks," Ms Cartes added.
"Our strategy has been to create multiple layers of defence, involving both technical infrastructure and human review, because abusive users often are highly motivated and creative about subverting anti-abuse mechanisms."
Jewish leaders met Home Secretary Theresa May this week to discuss the community's concerns over antisemitism and extremism.
