Twitter set to impose ban on political advertising
Twitter has announced it is banning all political advertising.
The company said social media firms gave advertisers an unfair advantage in proliferating targeted, misleading messages.
Chief executive Jack Dorsey added: "While advertising is incredibly powerful, that power brings risks to politics, where it can be used to influence votes."
The move came after Facebook was criticised for saying it would not fact-check political adverts.
In a meeting after Mr Dorsey's decision was announced, Facebook boss Mark Zuckerberg said his company believed political speech was important.
He added: "Some people accuse us of allowing speech because they think all we care about is making money.
"I can assure you that the controversy this creates far outweighs the very small percentage of our business that these political ads make up."