"While internet advertising is incredibly powerful and very effective for commercial advertisers, that power brings significant risks to politics", Dorsey added. "We believe political message reach should be earned, not bought", Dorsey tweeted late Wednesday afternoon.
The policy will come into effect on November 22, just weeks before the United Kingdom goes to the polls in a general election on December 12.
Mr Dorsey said the new policy, details of which will be unveiled next month, would ban ads on political issues as well as from candidates.
Twitter is ditching political ads.
"A political message earns reach when people decide to follow an account or retweet".
In a notable exchange with Rep. Alexandria Ocasio-Cortez (D-NY), Zuckerberg couldn't say for sure whether the congresswoman could run Facebook ads claiming that certain Republicans had voted for her Green New Deal.
Dorsey said he knew some may argue that Twitter's decision could favour incumbents, he also believed social movements can grow without political advertising. "This is about paying for reach", he wrote.
The majority of money spent on political advertising in the USA goes to television ads. "It's worth stepping back in order to address".
The CEO says Twitter will share the final new ad policy by November 15.
Dorsey said it wasn't "credible" to say that they were working to prevent "misleading" information on the platform at the same time that they allow people to pay for targeted political advertising.