Celebrities, politicians and religious leaders have joined a 48-hour boycott of the social media site Twitter, accusing it of failing to act swiftly enough to take down anti-Semitic posts by the grime artist Wiley.
Some of the offensive content remained visible for some 12 hours before being removed.
In a letter to the heads of Twitter and Facebook, the Chief Rabbi said their inaction “amounts to complicity”.
While Downing Street said the social media firms needed “to do better”.