Alison Chabloz, 54, from Glossop, Derbyshire, wrote and performed three songs about Nazi persecution, including one about the young diarist Anne Frank.
She claimed the Holocaust was “just a bunch of lies” in her songs.
Chabloz was convicted of two counts of sending an offensive, indecent or menacing message through a public communications network.
She was further convicted of posting a third song on YouTube.
District Judge John Zani, sitting at Westminster Magistrates’ Court, said the offences were serious and “the custody threshold may well have been passed.”
When the verdict was given supporters of Chabloz shouted “shame” from the public gallery.
Judge Zani adjourned the trial for sentencing.
It is a shame I cannot really make any Bubba jokes, since Chabloz is female.
Update: Huge loser.
But behind her bravado, the YouTube blogger who claimed the Holocaust was a hoax, has a bleak personal life.
She has been jobless since 2014 when she was ordered off a cruise ship where she worked – and was forced to move into the home of her parents, Leslie and Audrey Tyrer, in Charlesworth, Derbyshire.
But Mr Tyrer, 78, a retired insurance broker, told MailOnline that he had kicked her out several months ago.
‘I have no contact with her,’ he said. ‘The last thing I want in life is my 50-odd-year-old daughter getting in contact with me. She used to live here at the family home but doesn’t now.’
Her daughter Carmel, 26, a ski instructor, who lives with her father above his small flooring business in the pretty mountain village of Chateau D’Oex, hasn’t spoken to her mother for three years.
‘I’m not in contact with my mother at the moment and I don’t know anything she’s doing,’ she said.
Carmel’s father Pierre, who was married to Chabloz for 22 years, has ‘cut all connection’ to her, as has his brother Christophe Chabloz, according to Christophe’s ex-wife, Isabelle.
We have no contact with her at all, nothing and we don’t even know where she is,’ said Isabelle, who lives in nearby Échallens.
Ralph Smethurs, one of her two former bandmates, said that he ‘wouldn’t touch her with a bargepole’.
‘She is highly manipulative and controlling, and she has daft views,’ he said.
‘She said she seriously suspected the earth was flat. We tried to turn a deaf ear but we couldn’t ignore it. She’s crackers. It’s a shame because we had a good sound.’