To my knowledge, I don't know of any organization internationally leading a campaign on online hate. The closest one is FATF coming out of 1989. It originally was focused on the war on drugs and money laundering. It's now focused on anti-terrorism financing due to 9/11.
It does seem to me that Canada, as a founding partner, could certainly take this issue up with them to begin thinking about expanding the ambit of the RBA model, certainly within the government but also with FATF, that as it tries to include, I would argue, social media corporations as part of the non-financial businesses, they also include it in their oversight policies.