And he added an explainer of why to stand with X is to stand with free speech.

The convicted killer in the Tree of Life shootings had embraced that theory.

You have said the actual truth, Musk responded.

Elon Musk

Elon MuskLeon Neal/Getty Images

Media Matters

Media Matters reported on the advertising of major brands appearing next to pro-Nazi content on the platform.

Among those cited were IBM, Apple, Comcast Xfinity, Oracle and Bravo.

Ted Johnson contributed to this report.

Elon Musk

Media Matters President Angelo Carusone said in a statement, “Far from the free speech advocate he claims to be, Musk is a bully who threatens meritless lawsuits in an attempt to silence reporting that he even confirmed is accurate. Musk admitted the ads at issue ran alongside the pro-Nazi content we identified. If he does sue us, we will win.”Musk has previously threatened lawsuits against critics but not followed through. In September, when the Anti-Defamation League criticized the platform for increasing anti-semitic and other hate speech, Musk vowed litigation but none was filed. He blamed ADL for an advertising decline of 60%.