In several cases, police forces investigated the messages, and even recommended that individuals be prosecuted, LBC reported on Wednesday.
The Campaign Against Antisemitism (CAA) also reported to police a number of antisemitic messages posted on Twitter and Gab, a social media platform known as a safe haven for neo-Nazis.
In the wake of the Pittsburgh synagogue shootings, it was revealed that Robert Bowers, the suspected perpetrator, used Gab to send antisemitic threats.

Other offending messages include one, sent by a British white supremacist, which read: “I propose when we get the chance we exterminate the Jews by gassing.”
The same person also called for Britain to “change back to a proper white country”.
The JC understands that the investigation by Essex Police is still ongoing. A prosecution has not yet been brought, nor ruled out.
In another case, a former barrister tweeted about a prominent Jewish businessman: "Only Hitler dealt with his sort properly”.
A police investigation into the tweet was later dropped.
Earlier this year Alison Chabloz, a self-proclaimed Holocaust revisionist, was convicted of posting “grossly offensive” antisemitic songs online in a landmark case.
The CPS took up the case after CAA pursued a private prosecution against Chabloz. The charity said it did so after public prosecutors initially failed to do so.
Stephen Silverman, CAA’s director of investigations and enforcement, said: “The CPS is in dereliction of its duty to protect Jewish citizens."
A CPS spokesman said: “We can only consider charging someone once a file of evidence has been referred to us by the police. We will always prosecute instances of antisemitic hate speech where there is enough evidence to secure a conviction and it is in the public interest.”