Twitter to permanently ban impersonators, Musk says

• Musk has been a staunch advocate for free speech on Twitter and tweeted after the takeover, "Comedy is now legal on Twitter."

The big picture: Several Twitter users have changed their profile names to "Elon Musk" to parody the world's richest person since he completed the $44 billion acquisition of the company last month.

Details: "Previously, we issued a warning before suspension, but now that we are rolling out widespread verification, there will be no warning," Musk tweeted. "This will be clearly identified as a condition for signing up to Twitter Blue."

The bottom line: "Any name change at all will cause temporary loss of verified checkmark," Musk added.

Worth noting: Comedian Kathy Griffin's account was suspended for violating Twitter's rules before Musk's announcement. She had changed her profile name to "Elon Musk."

• Musk joked in a Sunday night tweet that Griffin was "suspended for impersonating a comedian."
• "But if she really wants her account back, she can have it" for $8, added Musk, in reference to Twitter's new subscription service that comes with a blue checkmark next to users' names.

Go deeper: Musk is managing Twitter Trump-style

Editor's note: This article has been updated with more comment from Twitter owner Elon Musk and further context.