Twitter, which reported last week that its service was restricted for some in Russia, told AFP the platform had not seen anything pointing to a blockage.
The news came as Russian president Vladimir Putin signed into law a bill introducing jail terms of up to 15 years for publishing “fake news” about the Russian army.
Russia’s lower house said in a statement that if fake news stories “led to serious consequences, (the legislation) threatens imprisonment of up to 15 years”.
The BBC said this week that the audience of its Russian language news website had “more than tripled... with a record reach of 10.7 million people in the last week”
Amendments were also passed to fine or jail people calling for sanctions against Russia.
The BBC, which has a large bureau in Moscow and runs a Russian-language news website, reacted by announcing a halt of its operations in Russia.
“This legislation appears to criminalise the process of independent journalism,” BBC Director-General Tim Davie said in a statement.
Bloomberg News also said it was suspending the work of its journalists in Russia. And CNN said it would stop broadcasting in Russia.
Two Russian outlets, Nobel Prize-winning newspaper Novaya Gazeta and business news website The Bell, said Friday they will stop reporting on Russia’s invasion of Ukraine to protect their journalists.
The past year has seen an unprecedented crackdown on independent and critical voices in Russia that has intensified since the invasion.
Valery Fadeyev, the head of the Kremlin’s human rights council, accused Western media of being behind “a huge flow of false information that comes from Ukraine”
Russia’s media watchdog said Friday it had restricted access to the BBC and other independent media websites, further tightening controls over the internet.
Foreign media restricted
The independent news website Meduza, German broadcaster Deutsche Welle, and the Russian-language website of the US-funded Radio Free Europe/Radio Liberty, Svoboda, were “limited”, said Roskomnadzor, following a request from prosecutors.
Valery Fadeyev, the head of the Kremlin’s human rights council, accused Western media of being behind “a huge flow of false information that comes from Ukraine” and said the council had set up a project to stop it.
Russia’s invasion has already claimed hundreds of lives, displaced more than a million people and spurred allegations of war crimes.
The White House said the United States is US “deeply concerned” about the Facebook block and more broadly about attacks against freedom of speech in Russia.
“This is a pattern this is not necessarily a new approach that they have taken,” said White House press secretary Jen Psaki. “Certainly we are deeply concerned about this and concerned about the threat to freedom of speech in the country.”
Moscow has few economic tools with which to respond but the Duma, or lower house, on Friday adopted a bill that would freeze any assets inside Russia of foreigners “violating rights of Russians”.
Russian media have been instructed to publish only information provided by official sources, which describe the invasion as a military operation.
For the moment, it appears the invasion has marked the beginning of the end for what remains of Russia’s independent media.
Ekho Moskvy -- a liberal-leaning radio station majority-owned by Russia’s energy giant Gazprom -- said Thursday it would shut down after being taken off air over its Ukraine war coverage.
Authorities had on Tuesday blocked the Ekho Moskvy website and took the station off air as punishment for spreading “deliberately false information” about the conflict.
Its editor-in-chef Alexei Venediktov said on Telegram Friday that the station will be deleting its website and social media accounts.
Another independent outlet, Znak, said Friday it was ceasing work “due to the large number of restrictions that have recently appeared for the work of the media in Russia”.
The BBC said this week that the audience of its Russian language news website had “more than tripled... with a record reach of 10.7 million people in the last week”.
A BBC spokesperson said the company would “continue our efforts to make BBC News available in Russia, and across the rest of the world” despite the restrictions.