British media group The Guardian has announced it will no longer post messages on X, formerly Twitter, calling it a “toxic media platform.”
In a message to readers, he said the US presidential election “underscored” his concerns that its owner, Elon Musk, may have used X to “shape political discourse”.
Mr Musk has strongly supported Donald Trump and has now been given a role in cutting government spending in his new administration.
The BBC has contacted X for comment.
The Guardian said users would still be able to share articles and that it would likely continue to incorporate X-rated publications into its coverage of world events.
But he added that “the advantages of being under X are now outweighed by the disadvantages.”
“This is something we have been considering for some time given the often disturbing content promoted or found on the platform, including far-right conspiracy theories and racism,” it added.
X users reacted with vitriol, with those who paid for prominent replies accusing it of “woke propaganda” and “virtue signalling”.
Mr Musk and the Guardian are far from political friends – but even so, his departure is likely to intensify questions about whether others will follow, as X and Mr Musk align themselves more with Donald Trump.
Its rivals already seem to be taking advantage.
Meta's Threads continued to grow and Bluesky, created by Twitter founder Jack Dorsey, briefly topped the download charts in the UK and US Apple App Stores on Wednesday as users searched for alternatives.
Its user base grew by four million in just two months, and Bluesky said in a post Tuesday that it added a million new users in the seven days after Trump's victory.
However, it remains relatively small, with 15 million users worldwide.