Twitter to ban all political advertising: CEO

Twitter decided Wednesday to ban political advertising globally, starting Nov. 22, according to the company's CEO Jack Dorsey.

"We believe political message reach should be earned, not bought," Dorsey said on Twitter, adding the changes will affect candidate and issue ads.

"While internet advertising is incredibly powerful and very effective for commercial advertisers, that power brings significant risks to politics, where it can be used to influence votes to affect the lives of millions," he added.

Dorsey stressed that online political ads present entirely new challenges to civic discourse, including "machine learning-based optimization of messaging and micro-targeting, unchecked misleading information, and deep fakes."

"All at increasing velocity, sophistication, and overwhelming scale," he said.

"Some might argue our actions today could favor incumbents," Dorsey said. "But we have witnessed many social movements reach massive scale without any political advertising."

"This isn't about free expression. This is about paying for reach," he emphasized and added that paying to increase the reach of political speech has "significant ramifications that today's democratic infrastructure may not be prepared to handle".

Noting that the final version will be made public Nov. 15, he said the new policy will be enforced Nov. 22 to provide current advertisers a notice period before this change goes into effect.