Elon Musk
Elon MuskReuters

Messaging platform X on Monday sued media watchdog group Media Matters, alleging the organization defamed the platform after it published a report that said ads for major brands had appeared next to posts touting Nazism, Reuters reported.

X, formerly Twitter, has faced growing outrage since Media Matters published the report on Thursday. Several companies, including IBM and Comcast, have pulled ads from the platform in response.

On Saturday, Musk posted that X would file a "thermonuclear" lawsuit against Media Matters and others "who colluded in this fraudulent attack on our company."

In an interview with Reuters earlier on Monday, Media Matters President Angelo Carusone said the nonprofit's findings flew in the face of X's statements that it had introduced safety protections to prevent ads from appearing next to harmful content.

"If you search for white nationalist content, there are ads flourishing. The system they say exists is not operating as such," he said.

Musk caused an uproar last week over a post in which he appeared to endorse an antisemitic conspiracy theory about Jewish people.

The backlash came after Musk replied, “You have said the actual truth,” to a post that repeated an antisemitic conspiracy theory suggesting Jews want to flood the country with minority groups from elsewhere.

The post read, “I’m deeply disinterested in giving the tiniest shit now about western Jewish populations coming to the disturbing realization that those hordes of minorities that support flooding their country don’t exactly like them too much.”

Responding to the fury on Sunday, Musk wrote, “This past week, there were hundreds of bogus media stories claiming that I am antisemitic. Nothing could be further from the truth. I wish only the best for humanity and a prosperous and exciting future for all.”

Musk previously had a tense relationship with the Anti-Defamation League (ADL), which culminated in Musk threatening a defamation lawsuit against the organization.

Musk’s threat to file a defamation lawsuit against the ADL came several days after he suggested holding a poll on X asking users whether to ban the ADL from the platform.

The CEO of X had earlier “liked” the tweet launching the hashtag #BanTheADL by Keith Woods, an Irish white nationalist and self-described “raging antisemite.”

The ADL ultimately ended its feud with Musk, announcing it will resume advertising on X.