Less than 24 hours after Elon Musk endorsed an anti-Semitic post on X as “the actual truth” of what Jewish people were doing, IBM paused its advertising on the social media platform as X’s chief executive, Linda Yaccarino, and others at the company scrambled on Thursday to contain the fallout.

X employees said on Thursday that they had gotten calls from advertisers wondering why Mr. Musk was making comments seen as anti-Semitic and why their ads were showing up next to white nationalist and Nazi content, according to internal messages that were viewed by The New York Times. IBM cut off about $1 million in advertising spending that it had committed to the platform for the last three months of the year, the messages said.

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