Meta on Tuesday started blocking Canadians' access to news on Facebook and Instagram in response to a new law requiring digital giants to pay publishers for such content.

Google, another critic of the Online News Act, has said it is considering a similar move, among an ongoing global debate as more governments try to make tech firms pay for news content.

"News links and content posted by news publishers and broadcasters in Canada will no longer be viewable by people in Canada," Meta said in a statement.