Margaret Atwood has taken to Twitter to defend herself after writing a controversial op-ed in which she wondered if she was a "bad feminist" for questioning the tactics of the #MeToo movement.

In a piece published Saturday in The Globe and Mail, Atwood called #MeToo "a symptom of a broken legal system".

The op-ed drew sharp criticism from some observers, who were angered by what they saw as a betrayal of feminist values by an author who has long been interested in examining and questioning power structures that subjugate women.

She wrote in the piece that women are increasingly using online channels to make accusations of sexual misconduct because the legal system is often ineffective.

But she expressed misgivings about the movement going too far, writing of the dangers of "vigilante justice" which she said can turn into "a culturally solidified lynch-mob habit."

The 78-year-old author of "The Handmaid's Tale", who is famously active on Twitter, sent out more than 30 tweets on Sunday morning defending the positions she made in the piece.