Axel Rudakubana, who killed three girls in a stabbing spree at a dance class, was obsessed with violence but had no known ideology. His case has led to calls for a rethink of counterterror strategy.

His comments to the hard-right Alternative for Germany party escalated efforts by the billionaire to influence the country’s election for chancellor next month.

Kash Patel’s public comments on the QAnon conspiracy theory suggests he sees its adherents more as an audience to be courted rather than an ideology to follow.

Mr. Musk has fallen out with prominent right-wing Americans who say they are worried that their agenda may be sidelined in favor of his own — and that he is willing to silence them on X.

Is liberalism actually dead this time?

With 211 million followers on social media, the multibillionaire seems intent on using his global platform to rattle British politics.

Elon Musk, the billionaire backer of Donald J. Trump, had been promoting Nigel Farage. But on Sunday Mr. Musk said Mr. Farage “doesn’t have what it takes.”

Right-wing YouTube​rs helped President Yoon Suk Yeol​ win his election. They are now his allies in the wake of his botched imposition of martial law.

In a barrage of posts rife with misinformation, he revived questions about a child sex abuse scandal, vilified the prime minister and defended a jailed far-right agitator.

Even as Telegram faces legal scrutiny and grapples with billions in debt, it is set to be profitable for the first time as it tries cryptocurrencies, subscriptions and ads.