New Delhi, Aug. 1 -- Hard-right commentators, politicians and activists in Europe have uncovered a secret to expanding their influence: engaging with Elon Musk.

Take the German politician from a party whose own domestic intelligence agency has designated as extremist. Her daily audience on X surged from 230,000 to 2.2 million on days Musk interacted with her posts. She went on to lead her party to its best-ever electoral showing.

Or the anti-immigration activist in Britain, who was banned from Twitter and sentenced to 18 months in prison for contempt of court. Since Musk let him back on the platform in late 2023, he's mentioned, reposted or replied to the billionaire more than 120 times on X - and gained nearly a million followers.

Eve...