MANILA (Reuters) - The head of a Philippine online news site battling revocation of its licence on Tuesday said some governments have sought to “silence dissent” through the proliferation of fake news, flooding social media with hate messages.

FILE PHOTO - Rappler CEO Maria Ressa visits the National Bureau of Investigation (NBI) on Taft avenue in metro Manila, Philippines January 22, 2018. REUTERS/Dondi Tawatao

There is now state-sponsored “patriotic trolling” designed to harass and intimidate, Maria Ressa, the chief executive of the news site, Rappler, told senators holding an inquiry into the spread of fake news in the Philippines.

“Social media provided cheap armies to potential authoritarian and dictators to control and manipulate public opinion,” Ressa said, citing a study in which Rappler participated that is set to be released in the next few months.

She did not provide details of the study, but said it mirrored the findings of a survey of 65 countries released last November by a U.S.-based group, Freedom House, that showed China and Russia were flooding social media with lies and disinformation, rather than seeking to control them.

Ressa also demonstrated for the senators how fake news was manufactured by false accounts and spread in Facebook, the top social media platform in the Philippines, with nearly 70 million users.

Governments have “weaponised the internet” to push propaganda, she said, but joined other journalists, bloggers and even the government’s communications office, to resist senators’ plans for measures to rein in social media.

In Southeast Asia, the media fear authoritarian leaders will use new laws to target legitimate news outlets critical of them, rather than focus on false stories published on social media, as they tighten clampdowns.

“There are existing laws,” she said. “I don’t believe that we should have more legislation but I think we should impose existing laws on this and demand accountability.”

The courts can deal with false information maligning people, said Roby Alampay, editor in chief of the BusinessWorld daily, asking lawmakers not to legislate controls on free speech, expression and the press.

“The important thing is to use our rights, to use your laws and to fight back,” Alampay added.

No laws will be passed to suppress freedom of the media and expression, said Grace Poe, head of the senate panel on public information, adding that senators were only interested on how to regulate the spread of false information on social media.

Rappler has invoked freedom of the press in its appeal to the Court of Appeals in the Philippines, challenging a decision of the Securities and Exchange Commission to revoke its license for violations of foreign equity curbs on domestic media.