Activist Tommy Robinson has been banned from Facebook and had his offical page removed for breaching its policy on "organised hate".
Robinson's Facebook page, which had amassed more than one million followers, had repeatedly used "dehumanising language" and called for violence "targeted at Muslims," according to the social network.
His profile on Instagram - which is owned by Facebook - has also been taken down.
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He was banned from Twitter in March 2018 and removed from PayPal in November. His last remaining official profile on a mainstream social media network is on YouTube, where he has nearly 300,000 subscribers.
Speaking to the Press Association, Robinson said he had not been told about the ban by Facebook.
"When putting me in prison and trying to kill me hasn't worked, when then trying to get mainstream documentaries to destroy my name with false allegations, that hasn't worked. Now, the establishment, which has gone for the plan of completely removing me from the public sphere - people will fight against this censorship, people will not like this censorship," he said.
"You're not just censoring me, you're censoring the public's option of listening to what I have to say. This is a complete attack on free speech which is going on across the world."
UKIP leader Gerard Batten, who hired Robinson as a personal adviser in November, tweeted his support for the activist.
"After 1m views of Tommy’s Panorama film his Facebook account has been shut down - for BS reasons," he wrote.
"Simultaneously articles appear in the Guardian & Independent. The left’s establishment are closing ranks & counter attacking. The people have only one weapon their votes. Join UKIP."